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.
[242.282, -72.161, -81.582, 218.159, -19.888, -68.005, 138.453, 212.849, 201.149, -7.279]