The math isn't all that complicated either. The Birds would just need either of the following two scenarios to occur:
Both scenarios start with the Eagles having to beat the 7-4 Titans at the Linc on Sunday. From there, they would need a bit of help.
Scenario 1: PHI win + WAS loss + SF loss or tie + SEA loss or tie (as long as both SF and SEA each don't tie) OR
Scenario 2: PHI win + WAS tie + SF loss + SEA loss
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The Commanders are red-hot, winners of six of their last seven, and face a reeling Giants team that has lost two straight.
San Francisco is also coming on as of late with four straight Ws, but faces the 8-3 Dolphins.
Seattle has been shaky of late but travels to Los Angeles to face a Rams team that has been decimated by injury.
FiveThirtyEight lists the Eagles at a 99% chance to make the playoffs, and it could happen as soon as Sunday if things fall into place for the Birds.