Finding the Third Proportional to 3,867,840 and 8,378,496

Step by Step Solution

1. Step 1: Write the proportion equation
   3,867,840 : 8,378,496 = 8,378,496 : x
2. Step 2: Convert to fraction form
   3,867,840/8,378,496 = 8,378,496/x
3. Step 3: Cross multiply
   3,867,840x = 8,378,496 × 8,378,496
4. Step 4: Simplify right side
   3,867,840x = 70,199,195,222,016
5. Step 5: Solve for x
   x = 70,199,195,222,016/3,867,840
6. Step 6: Final answer
   x = 18,149,456.86