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Belive it or not, I have the same setup as you!
I use the DVI to VGA adapter that (I think?) came with the MBP. It is just a small square that plugs into the DVI connection on the MBP and screws in.
I had a VGA to VGA cable just laying around, and what do you know, the Vizio has a VGA input.
I would shut down your MBP, get this setup ready and power on the TV. Then boot up the pro and you're good to go!

Hope this helps you.
 
Cool, that sounds great. I will have to try it out. How does the picture look on the tv?
 
How funny! I do the same thing, except I have a DVI to HDMI cable. The picture looks fine and is great for watching movies!
 
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