Finding the Third Proportional to 57,499.88 and 85,890.38

Step by Step Solution

1. Step 1: Write the proportion equation
   57,499.88 : 85,890.38 = 85,890.38 : x
2. Step 2: Convert to fraction form
   57,499.88/85,890.38 = 85,890.38/x
3. Step 3: Cross multiply
   57,499.88x = 85,890.38 × 85,890.38
4. Step 4: Simplify right side
   57,499.88x = 7,377,156,517.64
5. Step 5: Solve for x
   x = 7,377,156,517.64/57,499.88
6. Step 6: Final answer
   x = 128,298.65