Finding the Third Proportional to 4,485,902 and 9,728,992

Step by Step Solution

1. Step 1: Write the proportion equation
   4,485,902 : 9,728,992 = 9,728,992 : x
2. Step 2: Convert to fraction form
   4,485,902/9,728,992 = 9,728,992/x
3. Step 3: Cross multiply
   4,485,902x = 9,728,992 × 9,728,992
4. Step 4: Simplify right side
   4,485,902x = 94,653,285,336,064
5. Step 5: Solve for x
   x = 94,653,285,336,064/4,485,902
6. Step 6: Final answer
   x = 21,100,167.89