Finding the Fourth Proportional to 1,144.34, 1,578.56 and 723.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.34 : 1,578.56 = 723.92 : x
2. Step 2: Convert to fraction form
   1,144.34/1,578.56 = 723.92/x
3. Step 3: Cross multiply
   1,144.34x = 1,578.56 × 723.92
4. Step 4: Simplify right side
   1,144.34x = 1,142,751.16
5. Step 5: Solve for x
   x = 1,142,751.16/1,144.34
6. Step 6: Final answer
   x = 998.61