Finding the Third Proportional to 31,391.75 and 67,762.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,391.75 : 67,762.75 = 67,762.75 : x
2. Step 2: Convert to fraction form
   31,391.75/67,762.75 = 67,762.75/x
3. Step 3: Cross multiply
   31,391.75x = 67,762.75 × 67,762.75
4. Step 4: Simplify right side
   31,391.75x = 4,591,790,287.56
5. Step 5: Solve for x
   x = 4,591,790,287.56/31,391.75
6. Step 6: Final answer
   x = 146,273.79