Simple answer:
volume needed = strike water + infusion(s) - amt absorbed/lost in MLT + sparge - evap
Using that equation, you can figure out whatever unknown you have. Assuming your protein rest is at 122', you could use the following profile. If your protein rest isn't 122', then it won't work quite right.
strike: 9 qts @ ~132' (~1 qt/lb, rest at 122')
infustion: 6 qts @ 211' (~1.5 qt/lb, rest at 154')
sparge vol: 4.5 gals
grain absorption: ~ 1.25 gal
preboil volume = 3.75 gal + 4.5 gal - 1.25 gal = 7 gal
evap volume: ~ 1.5 gal
postboil volume = 7 - 1.5 gal = 5.5 gal
Total water needed = 8.25 gal
Notice that you're getting a lot of different answers. Each will result in good, although slightly different beer because of different final volumes and efficiencies. Just pick a method and roll with it.
May I suggest a program like Beer Smith for your brewing pleasure?!?
If not, then check out the formulas in Papazian book or Palmer's website (
www.howtobrew.com)