Finding the Third Proportional to 3,968,399 and 8,613,308

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968,399 : 8,613,308 = 8,613,308 : x
2. Step 2: Convert to fraction form
   3,968,399/8,613,308 = 8,613,308/x
3. Step 3: Cross multiply
   3,968,399x = 8,613,308 × 8,613,308
4. Step 4: Simplify right side
   3,968,399x = 74,189,074,702,864
5. Step 5: Solve for x
   x = 74,189,074,702,864/3,968,399
6. Step 6: Final answer
   x = 18,694,963.56