Finding the Fourth Proportional to 13,144.88, 18,139.55 and 7,176.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.88 : 18,139.55 = 7,176.60 : x
2. Step 2: Convert to fraction form
   13,144.88/18,139.55 = 7,176.60/x
3. Step 3: Cross multiply
   13,144.88x = 18,139.55 × 7,176.60
4. Step 4: Simplify right side
   13,144.88x = 130,180,258.65
5. Step 5: Solve for x
   x = 130,180,258.65/13,144.88
6. Step 6: Final answer
   x = 9,903.49