Finding the Third Proportional to 4,579,138 and 9,945,540

Step by Step Solution

1. Step 1: Write the proportion equation
   4,579,138 : 9,945,540 = 9,945,540 : x
2. Step 2: Convert to fraction form
   4,579,138/9,945,540 = 9,945,540/x
3. Step 3: Cross multiply
   4,579,138x = 9,945,540 × 9,945,540
4. Step 4: Simplify right side
   4,579,138x = 98,913,765,891,600
5. Step 5: Solve for x
   x = 98,913,765,891,600/4,579,138
6. Step 6: Final answer
   x = 21,600,957.62