Finding the Third Proportional to 3,940,418 and 8,509,540

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,418 : 8,509,540 = 8,509,540 : x
2. Step 2: Convert to fraction form
   3,940,418/8,509,540 = 8,509,540/x
3. Step 3: Cross multiply
   3,940,418x = 8,509,540 × 8,509,540
4. Step 4: Simplify right side
   3,940,418x = 72,412,271,011,600
5. Step 5: Solve for x
   x = 72,412,271,011,600/3,940,418
6. Step 6: Final answer
   x = 18,376,799.37