Finding the Fourth Proportional to 12,208.69, 18,300.26 and 5,639.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,208.69 : 18,300.26 = 5,639.18 : x
2. Step 2: Convert to fraction form
   12,208.69/18,300.26 = 5,639.18/x
3. Step 3: Cross multiply
   12,208.69x = 18,300.26 × 5,639.18
4. Step 4: Simplify right side
   12,208.69x = 103,198,520.04
5. Step 5: Solve for x
   x = 103,198,520.04/12,208.69
6. Step 6: Final answer
   x = 8,452.88