Finding the Third Proportional to 3,928,215 and 8,456,784

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928,215 : 8,456,784 = 8,456,784 : x
2. Step 2: Convert to fraction form
   3,928,215/8,456,784 = 8,456,784/x
3. Step 3: Cross multiply
   3,928,215x = 8,456,784 × 8,456,784
4. Step 4: Simplify right side
   3,928,215x = 71,517,195,622,656
5. Step 5: Solve for x
   x = 71,517,195,622,656/3,928,215
6. Step 6: Final answer
   x = 18,206,028.85