Finding the Third Proportional to 31,872,478 and 69,690,498.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,872,478 : 69,690,498.50 = 69,690,498.50 : x
2. Step 2: Convert to fraction form
   31,872,478/69,690,498.50 = 69,690,498.50/x
3. Step 3: Cross multiply
   31,872,478x = 69,690,498.50 × 69,690,498.50
4. Step 4: Simplify right side
   31,872,478x = 4,856,765,581,178,502
5. Step 5: Solve for x
   x = 4,856,765,581,178,502/31,872,478
6. Step 6: Final answer
   x = 152,381,172.91