Finding the Fourth Proportional to 2,558.86, 3,530.98 and 1,439.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.86 : 3,530.98 = 1,439.77 : x
2. Step 2: Convert to fraction form
   2,558.86/3,530.98 = 1,439.77/x
3. Step 3: Cross multiply
   2,558.86x = 3,530.98 × 1,439.77
4. Step 4: Simplify right side
   2,558.86x = 5,083,791.88
5. Step 5: Solve for x
   x = 5,083,791.88/2,558.86
6. Step 6: Final answer
   x = 1,986.74