Single monitor stand?

So, I've currently got a triple monitor setup going, all Asus VE248H 24 inch monitors. (http://www.newegg.com/Product/Product.aspx?Item=N82E16824236102)

I have this other monitor that my uncle gave to my sister and she's no longer using. I would like to add it in as a fourth monitor above my central monitor. My monitors aren't on a single mounting system, so they're all three on their own stands, but I've managed to line them up pretty good for triple monitor surround play.

I don't know the exact height of my monitors from the surface of my desk, to the top of the monitors (can't find my tape measure) and I don't know the size of the monitor in question) but I'm going to estimate the height of my monitors to be about 28 inches from the surface of the desk to the top of the monitors themselves.

So I need a mount that I can put behind my central monitor to hold this fourth monitor. It doesn't need to sit flush with my central monitor, but I would like it to be close to some extent, I intend it to be my Battlescreen monitor in battlefield matches, so I need to be able to flick my eyes up to it with relative ease.

Any tips appreciated. If necessary I can clean my desk up and post pictures (the biggest issue is the GIANT mess of cables behind my monitors, with my PC behind my right hand monitor and my surround sound head unit behind my left hand monitor)

I measured 3ft . I have the top monitor at it highest point on the pole. 3ft includes includes how much of the monitor is above the pole. I imagine it does vary from different monitor sizes. I have a 22 inch above a 24 inch. I think the feet will be an issue for you depending on how you have the other monitors mounted.

http://www.newegg.com/Product/Product.aspx?Item=9SIA3BG14N7971&cm_re=vivo_monitor_stand-_-9SIA3BG14N7971-_-Product

I've used these before, super strong very well built and reasonable price.

I'm not sure of the size of the monitor I'm talking about, but I know it's older, and holding it up to my other monitors, I would say that it's the same size.

Another big problem, this desk, isn't a computer desk. It's an antique, supposedly a "captains desk" off of some really old ship. The back doesn't have any space where I could clamp a mount to, so I would need a "stand" that would simply stand behind my central monitor.

Luckily, it does have VESA mounts.