Finding the Third Proportional to 4,431,135 and 9,639,870

Step by Step Solution

1. Step 1: Write the proportion equation
   4,431,135 : 9,639,870 = 9,639,870 : x
2. Step 2: Convert to fraction form
   4,431,135/9,639,870 = 9,639,870/x
3. Step 3: Cross multiply
   4,431,135x = 9,639,870 × 9,639,870
4. Step 4: Simplify right side
   4,431,135x = 92,927,093,616,900
5. Step 5: Solve for x
   x = 92,927,093,616,900/4,431,135
6. Step 6: Final answer
   x = 20,971,397.54