Finding the Third Proportional to 3,983,916 and 8,643,372

Step by Step Solution

1. Step 1: Write the proportion equation
   3,983,916 : 8,643,372 = 8,643,372 : x
2. Step 2: Convert to fraction form
   3,983,916/8,643,372 = 8,643,372/x
3. Step 3: Cross multiply
   3,983,916x = 8,643,372 × 8,643,372
4. Step 4: Simplify right side
   3,983,916x = 74,707,879,530,384
5. Step 5: Solve for x
   x = 74,707,879,530,384/3,983,916
6. Step 6: Final answer
   x = 18,752,373.18