Finding the Third Proportional to 3,968,403 and 8,613,318

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968,403 : 8,613,318 = 8,613,318 : x
2. Step 2: Convert to fraction form
   3,968,403/8,613,318 = 8,613,318/x
3. Step 3: Cross multiply
   3,968,403x = 8,613,318 × 8,613,318
4. Step 4: Simplify right side
   3,968,403x = 74,189,246,969,124
5. Step 5: Solve for x
   x = 74,189,246,969,124/3,968,403
6. Step 6: Final answer
   x = 18,694,988.13