Finding the Fourth Proportional to 2,558.82, 3,531.18 and 1,439.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.82 : 3,531.18 = 1,439.76 : x
2. Step 2: Convert to fraction form
   2,558.82/3,531.18 = 1,439.76/x
3. Step 3: Cross multiply
   2,558.82x = 3,531.18 × 1,439.76
4. Step 4: Simplify right side
   2,558.82x = 5,084,051.72
5. Step 5: Solve for x
   x = 5,084,051.72/2,558.82
6. Step 6: Final answer
   x = 1,986.87