Finding the Fourth Proportional to 2,558.75, 3,530.88 and 1,439.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.75 : 3,530.88 = 1,439.49 : x
2. Step 2: Convert to fraction form
   2,558.75/3,530.88 = 1,439.49/x
3. Step 3: Cross multiply
   2,558.75x = 3,530.88 × 1,439.49
4. Step 4: Simplify right side
   2,558.75x = 5,082,666.45
5. Step 5: Solve for x
   x = 5,082,666.45/2,558.75
6. Step 6: Final answer
   x = 1,986.38