Finding the Fourth Proportional to 1,144.37, 1,578.85 and 696.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.37 : 1,578.85 = 696.40 : x
2. Step 2: Convert to fraction form
   1,144.37/1,578.85 = 696.40/x
3. Step 3: Cross multiply
   1,144.37x = 1,578.85 × 696.40
4. Step 4: Simplify right side
   1,144.37x = 1,099,505.45
5. Step 5: Solve for x
   x = 1,099,505.45/1,144.37
6. Step 6: Final answer
   x = 960.79