Finding the Fourth Proportional to 5,661.78, 7,813.71 and 3,144.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,661.78 : 7,813.71 = 3,144.15 : x
2. Step 2: Convert to fraction form
   5,661.78/7,813.71 = 3,144.15/x
3. Step 3: Cross multiply
   5,661.78x = 7,813.71 × 3,144.15
4. Step 4: Simplify right side
   5,661.78x = 24,567,476.30
5. Step 5: Solve for x
   x = 24,567,476.30/5,661.78
6. Step 6: Final answer
   x = 4,339.18