Finding the Fourth Proportional to 2,558.71, 3,530.37 and 1,439.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.71 : 3,530.37 = 1,439.58 : x
2. Step 2: Convert to fraction form
   2,558.71/3,530.37 = 1,439.58/x
3. Step 3: Cross multiply
   2,558.71x = 3,530.37 × 1,439.58
4. Step 4: Simplify right side
   2,558.71x = 5,082,250.04
5. Step 5: Solve for x
   x = 5,082,250.04/2,558.71
6. Step 6: Final answer
   x = 1,986.25