Finding the Fourth Proportional to 13,112.80, 18,096.02 and 7,144.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,112.80 : 18,096.02 = 7,144.56 : x
2. Step 2: Convert to fraction form
   13,112.80/18,096.02 = 7,144.56/x
3. Step 3: Cross multiply
   13,112.80x = 18,096.02 × 7,144.56
4. Step 4: Simplify right side
   13,112.80x = 129,288,100.65
5. Step 5: Solve for x
   x = 129,288,100.65/13,112.80
6. Step 6: Final answer
   x = 9,859.69