Finding the Third Proportional to 4,431,608 and 9,639,667

Step by Step Solution

1. Step 1: Write the proportion equation
   4,431,608 : 9,639,667 = 9,639,667 : x
2. Step 2: Convert to fraction form
   4,431,608/9,639,667 = 9,639,667/x
3. Step 3: Cross multiply
   4,431,608x = 9,639,667 × 9,639,667
4. Step 4: Simplify right side
   4,431,608x = 92,923,179,870,889
5. Step 5: Solve for x
   x = 92,923,179,870,889/4,431,608
6. Step 6: Final answer
   x = 20,968,276.05