For a general breakdown of the definitions please refer to the chart below:
Active Users Users who have viewed at least one item in the previous 30 days. Participating Users Users who have commented, liked, rated/voted, edited, or created content in the previous 30 days. Contributing Users Users who have created new content in the previous 30 days. You need to actually create something and not just respond to existing content to be considered a contributing user. For example, you can start a discussion, ask a question, or post a document in order to be considered a contributing user.
As such these are sub-sets of users, so:
all users included in the Contributing counts should also be in the Participating/Active counts
all users in the Participating counts should also be in the Active counts.