Finding the Third Proportional to 4,483,290 and 9,728,660

Step by Step Solution

1. Step 1: Write the proportion equation
   4,483,290 : 9,728,660 = 9,728,660 : x
2. Step 2: Convert to fraction form
   4,483,290/9,728,660 = 9,728,660/x
3. Step 3: Cross multiply
   4,483,290x = 9,728,660 × 9,728,660
4. Step 4: Simplify right side
   4,483,290x = 94,646,825,395,600
5. Step 5: Solve for x
   x = 94,646,825,395,600/4,483,290
6. Step 6: Final answer
   x = 21,111,020.12