Finding the Third Proportional to 12,979,706 and 20,177,540

Step by Step Solution

1. Step 1: Write the proportion equation
   12,979,706 : 20,177,540 = 20,177,540 : x
2. Step 2: Convert to fraction form
   12,979,706/20,177,540 = 20,177,540/x
3. Step 3: Cross multiply
   12,979,706x = 20,177,540 × 20,177,540
4. Step 4: Simplify right side
   12,979,706x = 407,133,120,451,600
5. Step 5: Solve for x
   x = 407,133,120,451,600/12,979,706
6. Step 6: Final answer
   x = 31,366,898.48