Finding the Third Proportional to 3,987,880 and 8,648,816

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,880 : 8,648,816 = 8,648,816 : x
2. Step 2: Convert to fraction form
   3,987,880/8,648,816 = 8,648,816/x
3. Step 3: Cross multiply
   3,987,880x = 8,648,816 × 8,648,816
4. Step 4: Simplify right side
   3,987,880x = 74,802,018,201,856
5. Step 5: Solve for x
   x = 74,802,018,201,856/3,987,880
6. Step 6: Final answer
   x = 18,757,339.29