Finding the Third Proportional to 4,648,140 and 9,968,657

Step by Step Solution

1. Step 1: Write the proportion equation
   4,648,140 : 9,968,657 = 9,968,657 : x
2. Step 2: Convert to fraction form
   4,648,140/9,968,657 = 9,968,657/x
3. Step 3: Cross multiply
   4,648,140x = 9,968,657 × 9,968,657
4. Step 4: Simplify right side
   4,648,140x = 99,374,122,383,649
5. Step 5: Solve for x
   x = 99,374,122,383,649/4,648,140
6. Step 6: Final answer
   x = 21,379,330.74