Finding the Third Proportional to 7,981,668 and 12,171,780

Step by Step Solution

1. Step 1: Write the proportion equation
   7,981,668 : 12,171,780 = 12,171,780 : x
2. Step 2: Convert to fraction form
   7,981,668/12,171,780 = 12,171,780/x
3. Step 3: Cross multiply
   7,981,668x = 12,171,780 × 12,171,780
4. Step 4: Simplify right side
   7,981,668x = 148,152,228,368,400
5. Step 5: Solve for x
   x = 148,152,228,368,400/7,981,668
6. Step 6: Final answer
   x = 18,561,562.37