Finding the Fourth Proportional to 12,128.04, 18,167.76 and 5,545.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.04 : 18,167.76 = 5,545.20 : x
2. Step 2: Convert to fraction form
   12,128.04/18,167.76 = 5,545.20/x
3. Step 3: Cross multiply
   12,128.04x = 18,167.76 × 5,545.20
4. Step 4: Simplify right side
   12,128.04x = 100,743,862.75
5. Step 5: Solve for x
   x = 100,743,862.75/12,128.04
6. Step 6: Final answer
   x = 8,306.69