Finding the Fourth Proportional to 2,558.61, 3,530.63 and 1,439.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.61 : 3,530.63 = 1,439.52 : x
2. Step 2: Convert to fraction form
   2,558.61/3,530.63 = 1,439.52/x
3. Step 3: Cross multiply
   2,558.61x = 3,530.63 × 1,439.52
4. Step 4: Simplify right side
   2,558.61x = 5,082,412.50
5. Step 5: Solve for x
   x = 5,082,412.50/2,558.61
6. Step 6: Final answer
   x = 1,986.40