Finding the Third Proportional to 56,680.38 and 85,658.45

Step by Step Solution

1. Step 1: Write the proportion equation
   56,680.38 : 85,658.45 = 85,658.45 : x
2. Step 2: Convert to fraction form
   56,680.38/85,658.45 = 85,658.45/x
3. Step 3: Cross multiply
   56,680.38x = 85,658.45 × 85,658.45
4. Step 4: Simplify right side
   56,680.38x = 7,337,369,922.56
5. Step 5: Solve for x
   x = 7,337,369,922.56/56,680.38
6. Step 6: Final answer
   x = 129,451.66