Finding the Third Proportional to 57,616.50 and 86,426.25

Step by Step Solution

1. Step 1: Write the proportion equation
   57,616.50 : 86,426.25 = 86,426.25 : x
2. Step 2: Convert to fraction form
   57,616.50/86,426.25 = 86,426.25/x
3. Step 3: Cross multiply
   57,616.50x = 86,426.25 × 86,426.25
4. Step 4: Simplify right side
   57,616.50x = 7,469,496,689.06
5. Step 5: Solve for x
   x = 7,469,496,689.06/57,616.50
6. Step 6: Final answer
   x = 129,641.63