Finding the Third Proportional to 4,431,132 and 9,639,864

Step by Step Solution

1. Step 1: Write the proportion equation
   4,431,132 : 9,639,864 = 9,639,864 : x
2. Step 2: Convert to fraction form
   4,431,132/9,639,864 = 9,639,864/x
3. Step 3: Cross multiply
   4,431,132x = 9,639,864 × 9,639,864
4. Step 4: Simplify right side
   4,431,132x = 92,926,977,938,496
5. Step 5: Solve for x
   x = 92,926,977,938,496/4,431,132
6. Step 6: Final answer
   x = 20,971,385.63