Finding the Third Proportional to 3,940,458 and 8,509,620

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,458 : 8,509,620 = 8,509,620 : x
2. Step 2: Convert to fraction form
   3,940,458/8,509,620 = 8,509,620/x
3. Step 3: Cross multiply
   3,940,458x = 8,509,620 × 8,509,620
4. Step 4: Simplify right side
   3,940,458x = 72,413,632,544,400
5. Step 5: Solve for x
   x = 72,413,632,544,400/3,940,458
6. Step 6: Final answer
   x = 18,376,958.35