Finding the Fourth Proportional to 1,280.91, 1,920.00 and 1,144.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.91 : 1,920.00 = 1,144.23 : x
2. Step 2: Convert to fraction form
   1,280.91/1,920.00 = 1,144.23/x
3. Step 3: Cross multiply
   1,280.91x = 1,920.00 × 1,144.23
4. Step 4: Simplify right side
   1,280.91x = 2,196,918.69
5. Step 5: Solve for x
   x = 2,196,918.69/1,280.91
6. Step 6: Final answer
   x = 1,715.12