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.
[-25.605, 238.372, -39.335, 154.624, 119.183, -77.927, -36.238, 78.198, 168.389, 220.235]