Finding the Third Proportional to 3,879,648 and 8,430,744

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,648 : 8,430,744 = 8,430,744 : x
2. Step 2: Convert to fraction form
   3,879,648/8,430,744 = 8,430,744/x
3. Step 3: Cross multiply
   3,879,648x = 8,430,744 × 8,430,744
4. Step 4: Simplify right side
   3,879,648x = 71,077,444,393,536
5. Step 5: Solve for x
   x = 71,077,444,393,536/3,879,648
6. Step 6: Final answer
   x = 18,320,591.04