Finding the Third Proportional to 8,309,518 and 12,431,059

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309,518 : 12,431,059 = 12,431,059 : x
2. Step 2: Convert to fraction form
   8,309,518/12,431,059 = 12,431,059/x
3. Step 3: Cross multiply
   8,309,518x = 12,431,059 × 12,431,059
4. Step 4: Simplify right side
   8,309,518x = 154,531,227,861,481
5. Step 5: Solve for x
   x = 154,531,227,861,481/8,309,518
6. Step 6: Final answer
   x = 18,596,894.29