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.
[[84, 58, -140], [-136, -41, -52, -155, 96, -58], [56, 80, 39, 31, -90, -13, 87], [-101, 81]]