Finding the Fourth Proportional to 13,144.92, 18,139.86 and 7,176.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.92 : 18,139.86 = 7,176.78 : x
2. Step 2: Convert to fraction form
   13,144.92/18,139.86 = 7,176.78/x
3. Step 3: Cross multiply
   13,144.92x = 18,139.86 × 7,176.78
4. Step 4: Simplify right side
   13,144.92x = 130,185,784.45
5. Step 5: Solve for x
   x = 130,185,784.45/13,144.92
6. Step 6: Final answer
   x = 9,903.89