Finding the Fourth Proportional to 8,979.86, 12,400.02 and 5,628.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,979.86 : 12,400.02 = 5,628.42 : x
2. Step 2: Convert to fraction form
   8,979.86/12,400.02 = 5,628.42/x
3. Step 3: Cross multiply
   8,979.86x = 12,400.02 × 5,628.42
4. Step 4: Simplify right side
   8,979.86x = 69,792,520.57
5. Step 5: Solve for x
   x = 69,792,520.57/8,979.86
6. Step 6: Final answer
   x = 7,772.11