Finding the Third Proportional to 123,903 and 172,408.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,903 : 172,408.50 = 172,408.50 : x
2. Step 2: Convert to fraction form
   123,903/172,408.50 = 172,408.50/x
3. Step 3: Cross multiply
   123,903x = 172,408.50 × 172,408.50
4. Step 4: Simplify right side
   123,903x = 29,724,690,872.25
5. Step 5: Solve for x
   x = 29,724,690,872.25/123,903
6. Step 6: Final answer
   x = 239,902.91