Finding the Third Proportional to 8,458,612 and 12,690,510

Step by Step Solution

1. Step 1: Write the proportion equation
   8,458,612 : 12,690,510 = 12,690,510 : x
2. Step 2: Convert to fraction form
   8,458,612/12,690,510 = 12,690,510/x
3. Step 3: Cross multiply
   8,458,612x = 12,690,510 × 12,690,510
4. Step 4: Simplify right side
   8,458,612x = 161,049,044,060,100
5. Step 5: Solve for x
   x = 161,049,044,060,100/8,458,612
6. Step 6: Final answer
   x = 19,039,653.79