Finding the Third Proportional to 3,968,401 and 8,613,312

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968,401 : 8,613,312 = 8,613,312 : x
2. Step 2: Convert to fraction form
   3,968,401/8,613,312 = 8,613,312/x
3. Step 3: Cross multiply
   3,968,401x = 8,613,312 × 8,613,312
4. Step 4: Simplify right side
   3,968,401x = 74,189,143,609,344
5. Step 5: Solve for x
   x = 74,189,143,609,344/3,968,401
6. Step 6: Final answer
   x = 18,694,971.50