Finding the Fourth Proportional to 2,558.15, 3,530.28 and 1,423.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.15 : 3,530.28 = 1,423.91 : x
2. Step 2: Convert to fraction form
   2,558.15/3,530.28 = 1,423.91/x
3. Step 3: Cross multiply
   2,558.15x = 3,530.28 × 1,423.91
4. Step 4: Simplify right side
   2,558.15x = 5,026,815.16
5. Step 5: Solve for x
   x = 5,026,815.16/2,558.15
6. Step 6: Final answer
   x = 1,965.02