Finding the Third Proportional to 3,987,842 and 8,648,740

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,842 : 8,648,740 = 8,648,740 : x
2. Step 2: Convert to fraction form
   3,987,842/8,648,740 = 8,648,740/x
3. Step 3: Cross multiply
   3,987,842x = 8,648,740 × 8,648,740
4. Step 4: Simplify right side
   3,987,842x = 74,800,703,587,600
5. Step 5: Solve for x
   x = 74,800,703,587,600/3,987,842
6. Step 6: Final answer
   x = 18,757,188.37