Finding the Third Proportional to 53,318.25 and 81,129.38

Step by Step Solution

1. Step 1: Write the proportion equation
   53,318.25 : 81,129.38 = 81,129.38 : x
2. Step 2: Convert to fraction form
   53,318.25/81,129.38 = 81,129.38/x
3. Step 3: Cross multiply
   53,318.25x = 81,129.38 × 81,129.38
4. Step 4: Simplify right side
   53,318.25x = 6,581,975,487.89
5. Step 5: Solve for x
   x = 6,581,975,487.89/53,318.25
6. Step 6: Final answer
   x = 123,446.95