Math mini-contest problem on D.Buzz for July 2021 [Day 2 - Problem B] 😎

Math mini-contest problem on D.Buzz for July 2021 [Day 2, Problem B] 😎

The decimal number 16,954.248 converts to 1,244.650 in another number system. What is the base of the other number system?

Rules at https://peakd.com/@savvyplayer/official-rules-for-my-july-2021-3-day-math-mini-contest-for-d-buzz.