Finding the Fourth Proportional to 2,580.56, 3,867.48 and 1,040.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.56 : 3,867.48 = 1,040.72 : x
2. Step 2: Convert to fraction form
   2,580.56/3,867.48 = 1,040.72/x
3. Step 3: Cross multiply
   2,580.56x = 3,867.48 × 1,040.72
4. Step 4: Simplify right side
   2,580.56x = 4,024,963.79
5. Step 5: Solve for x
   x = 4,024,963.79/2,580.56
6. Step 6: Final answer
   x = 1,559.72