Finding the Third Proportional to 31,731.75 and 69,691.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,731.75 : 69,691.69 = 69,691.69 : x
2. Step 2: Convert to fraction form
   31,731.75/69,691.69 = 69,691.69/x
3. Step 3: Cross multiply
   31,731.75x = 69,691.69 × 69,691.69
4. Step 4: Simplify right side
   31,731.75x = 4,856,931,306.60
5. Step 5: Solve for x
   x = 4,856,931,306.60/31,731.75
6. Step 6: Final answer
   x = 153,062.20