Finding the Fourth Proportional to 3,959.40, 5,912.20 and 3,543.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,959.40 : 5,912.20 = 3,543.86 : x
2. Step 2: Convert to fraction form
   3,959.40/5,912.20 = 3,543.86/x
3. Step 3: Cross multiply
   3,959.40x = 5,912.20 × 3,543.86
4. Step 4: Simplify right side
   3,959.40x = 20,952,009.09
5. Step 5: Solve for x
   x = 20,952,009.09/3,959.40
6. Step 6: Final answer
   x = 5,291.71