Finding the Fourth Proportional to 13,144.74, 18,139.89 and 7,176.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.74 : 18,139.89 = 7,176.48 : x
2. Step 2: Convert to fraction form
   13,144.74/18,139.89 = 7,176.48/x
3. Step 3: Cross multiply
   13,144.74x = 18,139.89 × 7,176.48
4. Step 4: Simplify right side
   13,144.74x = 130,180,557.79
5. Step 5: Solve for x
   x = 130,180,557.79/13,144.74
6. Step 6: Final answer
   x = 9,903.62