Finding the Fourth Proportional to 1,144.83, 1,578.34 and 909.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.83 : 1,578.34 = 909.56 : x
2. Step 2: Convert to fraction form
   1,144.83/1,578.34 = 909.56/x
3. Step 3: Cross multiply
   1,144.83x = 1,578.34 × 909.56
4. Step 4: Simplify right side
   1,144.83x = 1,435,586.02
5. Step 5: Solve for x
   x = 1,435,586.02/1,144.83
6. Step 6: Final answer
   x = 1,253.98