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.
[[-53, -26, -156, 87], [-73, -173, 18, -40, -175, 99], [-171, -75, 15, 18, -90, -162, -104]]