Finding the Fourth Proportional to 13,112.79, 18,095.22 and 7,144.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,112.79 : 18,095.22 = 7,144.38 : x
2. Step 2: Convert to fraction form
   13,112.79/18,095.22 = 7,144.38/x
3. Step 3: Cross multiply
   13,112.79x = 18,095.22 × 7,144.38
4. Step 4: Simplify right side
   13,112.79x = 129,279,127.86
5. Step 5: Solve for x
   x = 129,279,127.86/13,112.79
6. Step 6: Final answer
   x = 9,859.01