Finding the Third Proportional to 3,940,708 and 8,489,320

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,708 : 8,489,320 = 8,489,320 : x
2. Step 2: Convert to fraction form
   3,940,708/8,489,320 = 8,489,320/x
3. Step 3: Cross multiply
   3,940,708x = 8,489,320 × 8,489,320
4. Step 4: Simplify right side
   3,940,708x = 72,068,554,062,400
5. Step 5: Solve for x
   x = 72,068,554,062,400/3,940,708
6. Step 6: Final answer
   x = 18,288,224.87