Finding the Third Proportional to 3,940,454 and 8,509,612

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,454 : 8,509,612 = 8,509,612 : x
2. Step 2: Convert to fraction form
   3,940,454/8,509,612 = 8,509,612/x
3. Step 3: Cross multiply
   3,940,454x = 8,509,612 × 8,509,612
4. Step 4: Simplify right side
   3,940,454x = 72,413,496,390,544
5. Step 5: Solve for x
   x = 72,413,496,390,544/3,940,454
6. Step 6: Final answer
   x = 18,376,942.45