Finding the Third Proportional to 4,431,588 and 9,639,636

Step by Step Solution

1. Step 1: Write the proportion equation
   4,431,588 : 9,639,636 = 9,639,636 : x
2. Step 2: Convert to fraction form
   4,431,588/9,639,636 = 9,639,636/x
3. Step 3: Cross multiply
   4,431,588x = 9,639,636 × 9,639,636
4. Step 4: Simplify right side
   4,431,588x = 92,922,582,212,496
5. Step 5: Solve for x
   x = 92,922,582,212,496/4,431,588
6. Step 6: Final answer
   x = 20,968,235.81