Finding the Third Proportional to 57,472.50 and 86,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,472.50 : 86,287.50 = 86,287.50 : x
2. Step 2: Convert to fraction form
   57,472.50/86,287.50 = 86,287.50/x
3. Step 3: Cross multiply
   57,472.50x = 86,287.50 × 86,287.50
4. Step 4: Simplify right side
   57,472.50x = 7,445,532,656.25
5. Step 5: Solve for x
   x = 7,445,532,656.25/57,472.50
6. Step 6: Final answer
   x = 129,549.48