From a single 560 Ti, I don't think it's possible. You can definitely get 2 monitors and use them as Extended or Duplicate, but you can not run a third monitor. You would need to buy a second 560 Ti and run them in SLI.
I thought well why can't I use the i5 (Intel HD 3000) to run a 3rd monitor, but I was told you must choose which graphics to use. The Intel 3000HD or 560-Ti. So it's not possible to run 3 monitors with one GPU.