Finding the Third Proportional to 3,987,891 and 8,648,838

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,891 : 8,648,838 = 8,648,838 : x
2. Step 2: Convert to fraction form
   3,987,891/8,648,838 = 8,648,838/x
3. Step 3: Cross multiply
   3,987,891x = 8,648,838 × 8,648,838
4. Step 4: Simplify right side
   3,987,891x = 74,802,398,750,244
5. Step 5: Solve for x
   x = 74,802,398,750,244/3,987,891
6. Step 6: Final answer
   x = 18,757,382.98