In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[-102, 34, -76, 89], [-14, -101, 99, 78, -147, -126, -117], [31, 97, -39]]