Finding the Fourth Proportional to 12,445.80, 17,177.72 and 7,144.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,445.80 : 17,177.72 = 7,144.24 : x
2. Step 2: Convert to fraction form
   12,445.80/17,177.72 = 7,144.24/x
3. Step 3: Cross multiply
   12,445.80x = 17,177.72 × 7,144.24
4. Step 4: Simplify right side
   12,445.80x = 122,721,754.33
5. Step 5: Solve for x
   x = 122,721,754.33/12,445.80
6. Step 6: Final answer
   x = 9,860.50