Finding the Third Proportional to 57,757.50 and 86,397.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,757.50 : 86,397.75 = 86,397.75 : x
2. Step 2: Convert to fraction form
   57,757.50/86,397.75 = 86,397.75/x
3. Step 3: Cross multiply
   57,757.50x = 86,397.75 × 86,397.75
4. Step 4: Simplify right side
   57,757.50x = 7,464,571,205.06
5. Step 5: Solve for x
   x = 7,464,571,205.06/57,757.50
6. Step 6: Final answer
   x = 129,239.86