Finding the Third Proportional to 3,977,978 and 8,708,260

Step by Step Solution

1. Step 1: Write the proportion equation
   3,977,978 : 8,708,260 = 8,708,260 : x
2. Step 2: Convert to fraction form
   3,977,978/8,708,260 = 8,708,260/x
3. Step 3: Cross multiply
   3,977,978x = 8,708,260 × 8,708,260
4. Step 4: Simplify right side
   3,977,978x = 75,833,792,227,600
5. Step 5: Solve for x
   x = 75,833,792,227,600/3,977,978
6. Step 6: Final answer
   x = 19,063,401.61