Finding the Third Proportional to 7,981,674 and 12,171,789

Step by Step Solution

1. Step 1: Write the proportion equation
   7,981,674 : 12,171,789 = 12,171,789 : x
2. Step 2: Convert to fraction form
   7,981,674/12,171,789 = 12,171,789/x
3. Step 3: Cross multiply
   7,981,674x = 12,171,789 × 12,171,789
4. Step 4: Simplify right side
   7,981,674x = 148,152,447,460,521
5. Step 5: Solve for x
   x = 148,152,447,460,521/7,981,674
6. Step 6: Final answer
   x = 18,561,575.86