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.
[[90, -84, -29, -87, 60], [-148, -91, 17, 2, -189, 74, 18], [61, 22, 9]]