Finding the Fourth Proportional to 12,540.38, 18,813.18 and 5,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,540.38 : 18,813.18 = 5,144.72 : x
2. Step 2: Convert to fraction form
   12,540.38/18,813.18 = 5,144.72/x
3. Step 3: Cross multiply
   12,540.38x = 18,813.18 × 5,144.72
4. Step 4: Simplify right side
   12,540.38x = 96,788,543.41
5. Step 5: Solve for x
   x = 96,788,543.41/12,540.38
6. Step 6: Final answer
   x = 7,718.15