Finding the Third Proportional to 3,940,692 and 8,489,288

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,692 : 8,489,288 = 8,489,288 : x
2. Step 2: Convert to fraction form
   3,940,692/8,489,288 = 8,489,288/x
3. Step 3: Cross multiply
   3,940,692x = 8,489,288 × 8,489,288
4. Step 4: Simplify right side
   3,940,692x = 72,068,010,746,944
5. Step 5: Solve for x
   x = 72,068,010,746,944/3,940,692
6. Step 6: Final answer
   x = 18,288,161.25