In this task, you will be given a list of numbers. The goal is to divide all the numbers in the list by a constant such that the sum of the resulting list is 1. The output should be rounded to 3 decimals.
[-81.504, 134.489, -65.889, -18.724, 39.783, 159.786, 39.305, -86.214, 35.264, -85.131]