Finding the Third Proportional to 4,510,989 and 9,915,120

Step by Step Solution

1. Step 1: Write the proportion equation
   4,510,989 : 9,915,120 = 9,915,120 : x
2. Step 2: Convert to fraction form
   4,510,989/9,915,120 = 9,915,120/x
3. Step 3: Cross multiply
   4,510,989x = 9,915,120 × 9,915,120
4. Step 4: Simplify right side
   4,510,989x = 98,309,604,614,400
5. Step 5: Solve for x
   x = 98,309,604,614,400/4,510,989
6. Step 6: Final answer
   x = 21,793,359.42