Finding the Third Proportional to 3,940,655 and 8,489,212

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,655 : 8,489,212 = 8,489,212 : x
2. Step 2: Convert to fraction form
   3,940,655/8,489,212 = 8,489,212/x
3. Step 3: Cross multiply
   3,940,655x = 8,489,212 × 8,489,212
4. Step 4: Simplify right side
   3,940,655x = 72,066,720,380,944
5. Step 5: Solve for x
   x = 72,066,720,380,944/3,940,655
6. Step 6: Final answer
   x = 18,288,005.52