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.
[[57, 38, -13, 97, 39, -159, -31], [-90, -146, 29], [-35, -22], [-170, -23, -190], [92, 47, 29, -87, 4]]