You will need to have the Full Recovery Model enabled on all four databases.
Now you will issue a full backup on all four databases, let's say ten minutes before the point in time you require.
Now you will do a transaction log backup of each database, at a point in time immediately after the exact moment you need.
On the other end, you will restore each full backup
WITH NORECOVERY, and then transaction log backup, with the
WITH STOPAT switch to specify the exact moment in time you need, as a DATETIME.
RESTORE WITH RECOVERY at the end to bring them into active use.