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.
[-20.241, -15.069, -60.343, 245.602, 164.48, 125.268, -6.556, 98.041, 156.694, 165.815]