For starters, a gross is a dozen dozen, so we're looking for the sum of the first 144 digits after the decimal. 
 
In case you've only remembered the first 100, here's all 144:  
3 . 1 4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6 2 6 4 3 3 8 3 2 7 9 5 0 2 8 8 4 1 9 7 1 6 9 3 9 9 3 7 5 1 0 5 8 2 0 9 7 4 9 4 4 5 9 2 3 0 7 8 1 6 4 0 6 2 8 6 2 0 8 9 9 8 6 2 8 0 3 4 8 2 5 3 4 2 1 1 7 0 6 7 9 8 2 1 4 8 0 8 6 5 1 3 2 8 2 3 0 6 6 4 7 0 9 3 8 4 4 6 0 9 5 5 0 5 8 2 2 3 1 7 2 5 3 5 9

That's 13 0's, 11 1's, 18 2's, 16 3's, 14 4's, 14 5's, 13 6's, 10 7's, 18 8's, and 17 9's

Before we give you the answer, here's a quick reminder: