Finding the Fourth Proportional to 12,442.71, 17,192.79 and 9,945.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,442.71 : 17,192.79 = 9,945.42 : x
2. Step 2: Convert to fraction form
   12,442.71/17,192.79 = 9,945.42/x
3. Step 3: Cross multiply
   12,442.71x = 17,192.79 × 9,945.42
4. Step 4: Simplify right side
   12,442.71x = 170,989,517.52
5. Step 5: Solve for x
   x = 170,989,517.52/12,442.71
6. Step 6: Final answer
   x = 13,742.14