Finding the Third Proportional to 3,998,311 and 8,706,542

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,311 : 8,706,542 = 8,706,542 : x
2. Step 2: Convert to fraction form
   3,998,311/8,706,542 = 8,706,542/x
3. Step 3: Cross multiply
   3,998,311x = 8,706,542 × 8,706,542
4. Step 4: Simplify right side
   3,998,311x = 75,803,873,597,764
5. Step 5: Solve for x
   x = 75,803,873,597,764/3,998,311
6. Step 6: Final answer
   x = 18,958,973.83