Finding the Fourth Proportional to 2,558.38, 3,530.88 and 1,439.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.38 : 3,530.88 = 1,439.37 : x
2. Step 2: Convert to fraction form
   2,558.38/3,530.88 = 1,439.37/x
3. Step 3: Cross multiply
   2,558.38x = 3,530.88 × 1,439.37
4. Step 4: Simplify right side
   2,558.38x = 5,082,221.49
5. Step 5: Solve for x
   x = 5,082,221.49/2,558.38
6. Step 6: Final answer
   x = 1,986.50