Finding the Third Proportional to 8,309,840 and 12,519,436

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309,840 : 12,519,436 = 12,519,436 : x
2. Step 2: Convert to fraction form
   8,309,840/12,519,436 = 12,519,436/x
3. Step 3: Cross multiply
   8,309,840x = 12,519,436 × 12,519,436
4. Step 4: Simplify right side
   8,309,840x = 156,736,277,758,096
5. Step 5: Solve for x
   x = 156,736,277,758,096/8,309,840
6. Step 6: Final answer
   x = 18,861,527.75