Finding the Third Proportional to 3,968,404 and 8,613,320

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968,404 : 8,613,320 = 8,613,320 : x
2. Step 2: Convert to fraction form
   3,968,404/8,613,320 = 8,613,320/x
3. Step 3: Cross multiply
   3,968,404x = 8,613,320 × 8,613,320
4. Step 4: Simplify right side
   3,968,404x = 74,189,281,422,400
5. Step 5: Solve for x
   x = 74,189,281,422,400/3,968,404
6. Step 6: Final answer
   x = 18,694,992.10