Finding the Third Proportional to 3,940,592 and 8,509,872

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,592 : 8,509,872 = 8,509,872 : x
2. Step 2: Convert to fraction form
   3,940,592/8,509,872 = 8,509,872/x
3. Step 3: Cross multiply
   3,940,592x = 8,509,872 × 8,509,872
4. Step 4: Simplify right side
   3,940,592x = 72,417,921,456,384
5. Step 5: Solve for x
   x = 72,417,921,456,384/3,940,592
6. Step 6: Final answer
   x = 18,377,421.83