Finding the Third Proportional to 31,440 and 63,792

Step by Step Solution

1. Step 1: Write the proportion equation
   31,440 : 63,792 = 63,792 : x
2. Step 2: Convert to fraction form
   31,440/63,792 = 63,792/x
3. Step 3: Cross multiply
   31,440x = 63,792 × 63,792
4. Step 4: Simplify right side
   31,440x = 4,069,419,264
5. Step 5: Solve for x
   x = 4,069,419,264/31,440
6. Step 6: Final answer
   x = 129,434.45