Finding the Third Proportional to 53,131.50 and 81,405

Step by Step Solution

1. Step 1: Write the proportion equation
   53,131.50 : 81,405 = 81,405 : x
2. Step 2: Convert to fraction form
   53,131.50/81,405 = 81,405/x
3. Step 3: Cross multiply
   53,131.50x = 81,405 × 81,405
4. Step 4: Simplify right side
   53,131.50x = 6,626,774,025
5. Step 5: Solve for x
   x = 6,626,774,025/53,131.50
6. Step 6: Final answer
   x = 124,724.02