Finding the Fourth Proportional to 8,550.18, 12,808.20 and 5,619.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,550.18 : 12,808.20 = 5,619.60 : x
2. Step 2: Convert to fraction form
   8,550.18/12,808.20 = 5,619.60/x
3. Step 3: Cross multiply
   8,550.18x = 12,808.20 × 5,619.60
4. Step 4: Simplify right side
   8,550.18x = 71,976,960.72
5. Step 5: Solve for x
   x = 71,976,960.72/8,550.18
6. Step 6: Final answer
   x = 8,418.18