Finding the Fourth Proportional to 2,103.78, 3,153.28 and 1,280.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.78 : 3,153.28 = 1,280.24 : x
2. Step 2: Convert to fraction form
   2,103.78/3,153.28 = 1,280.24/x
3. Step 3: Cross multiply
   2,103.78x = 3,153.28 × 1,280.24
4. Step 4: Simplify right side
   2,103.78x = 4,036,950.45
5. Step 5: Solve for x
   x = 4,036,950.45/2,103.78
6. Step 6: Final answer
   x = 1,918.90