Just a note of clarification, the final Region 4-AAAA standings were as follows:

Tie for first - Lexington & South Aiken

Tie for Third - Aiken, N. Augusta, White Knoll

First and Third place were determined by Region tie breaking procedures that appear to be the same as for all other sports:
1st tiebreaker - Head-to-head won-lost
2nd - points based on ranking of region teams you defeated. 6 for first, 5 for second, etc.
3rd - non-region record
4th - coin toss

After third place was determined, there was a play-in game for fourth.