Finding the Third Proportional to 4,609,648 and 9,957,870

Step by Step Solution

1. Step 1: Write the proportion equation
   4,609,648 : 9,957,870 = 9,957,870 : x
2. Step 2: Convert to fraction form
   4,609,648/9,957,870 = 9,957,870/x
3. Step 3: Cross multiply
   4,609,648x = 9,957,870 × 9,957,870
4. Step 4: Simplify right side
   4,609,648x = 99,159,174,936,900
5. Step 5: Solve for x
   x = 99,159,174,936,900/4,609,648
6. Step 6: Final answer
   x = 21,511,224.92