Finding the Third Proportional to 3,940,668 and 8,489,238

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,668 : 8,489,238 = 8,489,238 : x
2. Step 2: Convert to fraction form
   3,940,668/8,489,238 = 8,489,238/x
3. Step 3: Cross multiply
   3,940,668x = 8,489,238 × 8,489,238
4. Step 4: Simplify right side
   3,940,668x = 72,067,161,820,644
5. Step 5: Solve for x
   x = 72,067,161,820,644/3,940,668
6. Step 6: Final answer
   x = 18,288,057.21