Finding the Third Proportional to 90,331 and 139,782

Step by Step Solution

1. Step 1: Write the proportion equation
   90,331 : 139,782 = 139,782 : x
2. Step 2: Convert to fraction form
   90,331/139,782 = 139,782/x
3. Step 3: Cross multiply
   90,331x = 139,782 × 139,782
4. Step 4: Simplify right side
   90,331x = 19,539,007,524
5. Step 5: Solve for x
   x = 19,539,007,524/90,331
6. Step 6: Final answer
   x = 216,304.56