Finding the Fourth Proportional to 12,442.78, 17,173.56 and 7,141.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,442.78 : 17,173.56 = 7,141.24 : x
2. Step 2: Convert to fraction form
   12,442.78/17,173.56 = 7,141.24/x
3. Step 3: Cross multiply
   12,442.78x = 17,173.56 × 7,141.24
4. Step 4: Simplify right side
   12,442.78x = 122,640,513.61
5. Step 5: Solve for x
   x = 122,640,513.61/12,442.78
6. Step 6: Final answer
   x = 9,856.36