Finding the Third Proportional to 4,648,142 and 9,968,661

Step by Step Solution

1. Step 1: Write the proportion equation
   4,648,142 : 9,968,661 = 9,968,661 : x
2. Step 2: Convert to fraction form
   4,648,142/9,968,661 = 9,968,661/x
3. Step 3: Cross multiply
   4,648,142x = 9,968,661 × 9,968,661
4. Step 4: Simplify right side
   4,648,142x = 99,374,202,132,921
5. Step 5: Solve for x
   x = 99,374,202,132,921/4,648,142
6. Step 6: Final answer
   x = 21,379,338.70