Finding the Third Proportional to 4,431,587 and 9,639,634

Step by Step Solution

1. Step 1: Write the proportion equation
   4,431,587 : 9,639,634 = 9,639,634 : x
2. Step 2: Convert to fraction form
   4,431,587/9,639,634 = 9,639,634/x
3. Step 3: Cross multiply
   4,431,587x = 9,639,634 × 9,639,634
4. Step 4: Simplify right side
   4,431,587x = 92,922,543,653,956
5. Step 5: Solve for x
   x = 92,922,543,653,956/4,431,587
6. Step 6: Final answer
   x = 20,968,231.84