Finding the Fourth Proportional to 3,943.37, 5,439.72 and 3,391.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,943.37 : 5,439.72 = 3,391.15 : x
2. Step 2: Convert to fraction form
   3,943.37/5,439.72 = 3,391.15/x
3. Step 3: Cross multiply
   3,943.37x = 5,439.72 × 3,391.15
4. Step 4: Simplify right side
   3,943.37x = 18,446,906.48
5. Step 5: Solve for x
   x = 18,446,906.48/3,943.37
6. Step 6: Final answer
   x = 4,677.95