Finding the Fourth Proportional to 13,144.32, 18,139.56 and 7,176.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.32 : 18,139.56 = 7,176.24 : x
2. Step 2: Convert to fraction form
   13,144.32/18,139.56 = 7,176.24/x
3. Step 3: Cross multiply
   13,144.32x = 18,139.56 × 7,176.24
4. Step 4: Simplify right side
   13,144.32x = 130,173,836.05
5. Step 5: Solve for x
   x = 130,173,836.05/13,144.32
6. Step 6: Final answer
   x = 9,903.43