Finding the Fourth Proportional to 3,939.59, 5,431.57 and 3,228.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.59 : 5,431.57 = 3,228.82 : x
2. Step 2: Convert to fraction form
   3,939.59/5,431.57 = 3,228.82/x
3. Step 3: Cross multiply
   3,939.59x = 5,431.57 × 3,228.82
4. Step 4: Simplify right side
   3,939.59x = 17,537,561.85
5. Step 5: Solve for x
   x = 17,537,561.85/3,939.59
6. Step 6: Final answer
   x = 4,451.62