Comment below to share how you came up with the missing number!
[edited by: emassa at 7:35 PM (GMT -4) on 31 Oct 2022]
Congratulation Ralph ! May be you had already answered to this in the past (Legacy-Maxim time...)
Anyhow, It is not evident to find the logic behind. But you get it (probably being in accounting, number associations have no secret for you!