Finding the Third Proportional to 3,940,476 and 8,509,656

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,476 : 8,509,656 = 8,509,656 : x
2. Step 2: Convert to fraction form
   3,940,476/8,509,656 = 8,509,656/x
3. Step 3: Cross multiply
   3,940,476x = 8,509,656 × 8,509,656
4. Step 4: Simplify right side
   3,940,476x = 72,414,245,238,336
5. Step 5: Solve for x
   x = 72,414,245,238,336/3,940,476
6. Step 6: Final answer
   x = 18,377,029.89