Finding the Fourth Proportional to 2,558.47, 3,530.55 and 1,439.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.47 : 3,530.55 = 1,439.59 : x
2. Step 2: Convert to fraction form
   2,558.47/3,530.55 = 1,439.59/x
3. Step 3: Cross multiply
   2,558.47x = 3,530.55 × 1,439.59
4. Step 4: Simplify right side
   2,558.47x = 5,082,544.47
5. Step 5: Solve for x
   x = 5,082,544.47/2,558.47
6. Step 6: Final answer
   x = 1,986.56