Finding the Third Proportional to 3,987,864 and 8,648,784

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,864 : 8,648,784 = 8,648,784 : x
2. Step 2: Convert to fraction form
   3,987,864/8,648,784 = 8,648,784/x
3. Step 3: Cross multiply
   3,987,864x = 8,648,784 × 8,648,784
4. Step 4: Simplify right side
   3,987,864x = 74,801,464,678,656
5. Step 5: Solve for x
   x = 74,801,464,678,656/3,987,864
6. Step 6: Final answer
   x = 18,757,275.74