Finding the Third Proportional to 3,987,868 and 8,697,536

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,868 : 8,697,536 = 8,697,536 : x
2. Step 2: Convert to fraction form
   3,987,868/8,697,536 = 8,697,536/x
3. Step 3: Cross multiply
   3,987,868x = 8,697,536 × 8,697,536
4. Step 4: Simplify right side
   3,987,868x = 75,647,132,471,296
5. Step 5: Solve for x
   x = 75,647,132,471,296/3,987,868
6. Step 6: Final answer
   x = 18,969,317.06