What is the automated method to check the Administrators, Domain Admins and Enterprise Admins groups weekly for membership additions or deletions?

You can create a powershell script to check the event logs daily to look for specific events related to 4728. This event is logged when a user has been added to a Global Group. You will also need to have Audit Account Management Enabled from the default domain controllers policy.

The email you the event once it logs and entries on any of the domain controllers.
Audit Account Management

This is quite a bit of work rather then just running the below commands

import-module activedirectory
Get-ADGroupMember -Identity "domain admins" | ft name,samaccountname

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import-module activedirectory
Get-ADGroupMember -Identity "enterprise admins" | ft name,samaccountname

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import-module activedirectory
Get-ADGroupMember -Identity "administrators" | ft name,samaccountname

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Thank you. What does 'ft' mean? May I pipe the output from each command to the same csv file?

Get-ADGroupMember -Identity "enterprise admins" | ft name,samaccountname > ADGroupMember.csv

I tried it but it didn't work. Inside the command is a separate pipe symbol | ... ideas?

Thank you. Well done. Mr. Will