Finding the Fourth Proportional to 12,180.24, 16,805.88 and 7,144.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,180.24 : 16,805.88 = 7,144.20 : x
2. Step 2: Convert to fraction form
   12,180.24/16,805.88 = 7,144.20/x
3. Step 3: Cross multiply
   12,180.24x = 16,805.88 × 7,144.20
4. Step 4: Simplify right side
   12,180.24x = 120,064,567.90
5. Step 5: Solve for x
   x = 120,064,567.90/12,180.24
6. Step 6: Final answer
   x = 9,857.32