Finding the Third Proportional to 3,647,140 and 8,442,478

Step by Step Solution

1. Step 1: Write the proportion equation
   3,647,140 : 8,442,478 = 8,442,478 : x
2. Step 2: Convert to fraction form
   3,647,140/8,442,478 = 8,442,478/x
3. Step 3: Cross multiply
   3,647,140x = 8,442,478 × 8,442,478
4. Step 4: Simplify right side
   3,647,140x = 71,275,434,780,484
5. Step 5: Solve for x
   x = 71,275,434,780,484/3,647,140
6. Step 6: Final answer
   x = 19,542,829.39