Finding the Third Proportional to 3,940,716 and 8,489,336

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,716 : 8,489,336 = 8,489,336 : x
2. Step 2: Convert to fraction form
   3,940,716/8,489,336 = 8,489,336/x
3. Step 3: Cross multiply
   3,940,716x = 8,489,336 × 8,489,336
4. Step 4: Simplify right side
   3,940,716x = 72,068,825,720,896
5. Step 5: Solve for x
   x = 72,068,825,720,896/3,940,716
6. Step 6: Final answer
   x = 18,288,256.68