Finding the Fourth Proportional to 1,144.17, 1,578.12 and 724.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.17 : 1,578.12 = 724.59 : x
2. Step 2: Convert to fraction form
   1,144.17/1,578.12 = 724.59/x
3. Step 3: Cross multiply
   1,144.17x = 1,578.12 × 724.59
4. Step 4: Simplify right side
   1,144.17x = 1,143,495.73
5. Step 5: Solve for x
   x = 1,143,495.73/1,144.17
6. Step 6: Final answer
   x = 999.41