Finding the Third Proportional to 5,438,978 and 8,392,707

Step by Step Solution

1. Step 1: Write the proportion equation
   5,438,978 : 8,392,707 = 8,392,707 : x
2. Step 2: Convert to fraction form
   5,438,978/8,392,707 = 8,392,707/x
3. Step 3: Cross multiply
   5,438,978x = 8,392,707 × 8,392,707
4. Step 4: Simplify right side
   5,438,978x = 70,437,530,787,849
5. Step 5: Solve for x
   x = 70,437,530,787,849/5,438,978
6. Step 6: Final answer
   x = 12,950,508.49