Finding the Third Proportional to 12,644,458 and 18,068,661

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644,458 : 18,068,661 = 18,068,661 : x
2. Step 2: Convert to fraction form
   12,644,458/18,068,661 = 18,068,661/x
3. Step 3: Cross multiply
   12,644,458x = 18,068,661 × 18,068,661
4. Step 4: Simplify right side
   12,644,458x = 326,476,510,332,921
5. Step 5: Solve for x
   x = 326,476,510,332,921/12,644,458
6. Step 6: Final answer
   x = 25,819,731.48