Finding the Third Proportional to 4,485,900 and 9,728,988

Step by Step Solution

1. Step 1: Write the proportion equation
   4,485,900 : 9,728,988 = 9,728,988 : x
2. Step 2: Convert to fraction form
   4,485,900/9,728,988 = 9,728,988/x
3. Step 3: Cross multiply
   4,485,900x = 9,728,988 × 9,728,988
4. Step 4: Simplify right side
   4,485,900x = 94,653,207,504,144
5. Step 5: Solve for x
   x = 94,653,207,504,144/4,485,900
6. Step 6: Final answer
   x = 21,100,159.95