Finding the Third Proportional to 3,987,840 and 8,648,736

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,840 : 8,648,736 = 8,648,736 : x
2. Step 2: Convert to fraction form
   3,987,840/8,648,736 = 8,648,736/x
3. Step 3: Cross multiply
   3,987,840x = 8,648,736 × 8,648,736
4. Step 4: Simplify right side
   3,987,840x = 74,800,634,397,696
5. Step 5: Solve for x
   x = 74,800,634,397,696/3,987,840
6. Step 6: Final answer
   x = 18,757,180.43