Finding the Third Proportional to 57,715.88 and 86,575.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,715.88 : 86,575.50 = 86,575.50 : x
2. Step 2: Convert to fraction form
   57,715.88/86,575.50 = 86,575.50/x
3. Step 3: Cross multiply
   57,715.88x = 86,575.50 × 86,575.50
4. Step 4: Simplify right side
   57,715.88x = 7,495,317,200.25
5. Step 5: Solve for x
   x = 7,495,317,200.25/57,715.88
6. Step 6: Final answer
   x = 129,865.78