Finding the Fourth Proportional to 2,558.41, 3,530.61 and 1,439.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.41 : 3,530.61 = 1,439.41 : x
2. Step 2: Convert to fraction form
   2,558.41/3,530.61 = 1,439.41/x
3. Step 3: Cross multiply
   2,558.41x = 3,530.61 × 1,439.41
4. Step 4: Simplify right side
   2,558.41x = 5,081,995.34
5. Step 5: Solve for x
   x = 5,081,995.34/2,558.41
6. Step 6: Final answer
   x = 1,986.39