Finding the Fourth Proportional to 1,144.24, 1,580.34 and 885.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.24 : 1,580.34 = 885.40 : x
2. Step 2: Convert to fraction form
   1,144.24/1,580.34 = 885.40/x
3. Step 3: Cross multiply
   1,144.24x = 1,580.34 × 885.40
4. Step 4: Simplify right side
   1,144.24x = 1,399,233.04
5. Step 5: Solve for x
   x = 1,399,233.04/1,144.24
6. Step 6: Final answer
   x = 1,222.85