Finding the Fourth Proportional to 2,558.52, 3,530.79 and 1,439.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.52 : 3,530.79 = 1,439.46 : x
2. Step 2: Convert to fraction form
   2,558.52/3,530.79 = 1,439.46/x
3. Step 3: Cross multiply
   2,558.52x = 3,530.79 × 1,439.46
4. Step 4: Simplify right side
   2,558.52x = 5,082,430.97
5. Step 5: Solve for x
   x = 5,082,430.97/2,558.52
6. Step 6: Final answer
   x = 1,986.47