10000 * 0.1287128712871287..=1287.128712871287
1* 0.1287128712871287 = 0.1287128712871287
(10000-1) * 0.1287128712871287 = 1287.12871287 - 0.128712871287...
9999 * 0.1287128712871287 = 1287
0.1287128712871287 = 1287 / 9999
you can now cancel down to get the most simple fraction possible.