If you take the expert averages (which assume a Wisconsin TRUMP win), then up TRUMP to 95/95 in NY and 105/172 in CA, he gets there.
This really shows how crucial WI is. Cruz cannot afford to lose.
If Trump loses Wisconsin, he can still get to 1,237 by winning Indiana, which I think will be easier for him than Wisconsin. Especially since it'll be a week after big wins on the 26th in PA, CT, DE and RI, which will be a week after a big win in NY, and if we believe momentum to be a thing, it should help Trump.
Here's my guess, assuming he wins Indiana.