The midlanders were on level terms heading into the last quarter of Saturday's game.
It was a heartbreaking end to the season for Athlone Town over the weekend.
Dario Castelo's side suffered a 3-1 defeat in the second leg of the League of Ireland First Division to Waterford on Saturday.
17-year-old Republic of Ireland Under 18 International Romeo Akachukwu came off the bench to net a second half hat-trick to send the Munster side to the playoff final this weekend.
📽️ | 17 year old Romeo Akachukwu is on a hattrick and Waterford have a place in the SSE Airtricity Men's First Division Play-Off Final in their hands again 🔥#LOI | #WATATH pic.twitter.com/HR9vPyXEWy
— League of Ireland (@LeagueofIreland) October 28, 2023
Frantz Pierrot scored Town's only goal from the penalty spot.
The season is now finished for the men's team.