Finding the Fourth Proportional to 5,381.91, 7,426.37 and 3,142.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,381.91 : 7,426.37 = 3,142.15 : x
2. Step 2: Convert to fraction form
   5,381.91/7,426.37 = 3,142.15/x
3. Step 3: Cross multiply
   5,381.91x = 7,426.37 × 3,142.15
4. Step 4: Simplify right side
   5,381.91x = 23,334,757.78
5. Step 5: Solve for x
   x = 23,334,757.78/5,381.91
6. Step 6: Final answer
   x = 4,335.78