Finding the Fourth Proportional to 2,560.50, 3,838.71 and 1,328.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.50 : 3,838.71 = 1,328.10 : x
2. Step 2: Convert to fraction form
   2,560.50/3,838.71 = 1,328.10/x
3. Step 3: Cross multiply
   2,560.50x = 3,838.71 × 1,328.10
4. Step 4: Simplify right side
   2,560.50x = 5,098,190.75
5. Step 5: Solve for x
   x = 5,098,190.75/2,560.50
6. Step 6: Final answer
   x = 1,991.09