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.
[[58, -108, 49, -109], [-142, -157], [60, -115, 62, 88, -69, 21], [-81, -14], [-80, 82, 99, 17]]