Finding the Fourth Proportional to 2,559.76, 3,840.42 and 1,328.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.76 : 3,840.42 = 1,328.05 : x
2. Step 2: Convert to fraction form
   2,559.76/3,840.42 = 1,328.05/x
3. Step 3: Cross multiply
   2,559.76x = 3,840.42 × 1,328.05
4. Step 4: Simplify right side
   2,559.76x = 5,100,269.78
5. Step 5: Solve for x
   x = 5,100,269.78/2,559.76
6. Step 6: Final answer
   x = 1,992.48