Finding the Third Proportional to 5,580,638 and 8,411,949

Step by Step Solution

1. Step 1: Write the proportion equation
   5,580,638 : 8,411,949 = 8,411,949 : x
2. Step 2: Convert to fraction form
   5,580,638/8,411,949 = 8,411,949/x
3. Step 3: Cross multiply
   5,580,638x = 8,411,949 × 8,411,949
4. Step 4: Simplify right side
   5,580,638x = 70,760,885,978,601
5. Step 5: Solve for x
   x = 70,760,885,978,601/5,580,638
6. Step 6: Final answer
   x = 12,679,712.60