Finding the Fourth Proportional to 1,144.68, 1,578.90 and 702.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.68 : 1,578.90 = 702.28 : x
2. Step 2: Convert to fraction form
   1,144.68/1,578.90 = 702.28/x
3. Step 3: Cross multiply
   1,144.68x = 1,578.90 × 702.28
4. Step 4: Simplify right side
   1,144.68x = 1,108,829.89
5. Step 5: Solve for x
   x = 1,108,829.89/1,144.68
6. Step 6: Final answer
   x = 968.68