Find Numbers Below 43,125: Odd Tens of Thousands Digit Challenge

To solve this problem, let's follow these steps to determine the correct choice:

• Step 1: Identify if the number is less than 43,125.
• Step 2: Check if the tens of thousands digit is odd.

Step 1: Let's evaluate each given choice based on the condition that the number must be less than 43,125:

• Option 1: $26,999$ is less than 43,125.
• Option 2: $32,100$ is less than 43,125.
• Option 3: $54,123$ is greater than 43,125.
• Option 4: $2,450$ is less than 43,125.

Step 2: Now let's check the tens of thousands digit for oddness:

• Option 1: $26,999$ has a tens of thousands digit of 2 (even).
• Option 2: $32,100$ has a tens of thousands digit of 3 (odd).
• Option 3: $54,123$ has a tens of thousands digit of 5 (odd) but doesn't satisfy condition 1.
• Option 4: $2,450$ has a tens of thousands digit of 0 (even).

From these evaluations, only $32,100$ is less than 43,125 and has an odd tens of thousands digit of 3.

Therefore, the solution to the problem is $32,100$.