Finding the Fourth Proportional to 1,144.34, 1,578.57 and 723.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.34 : 1,578.57 = 723.91 : x
2. Step 2: Convert to fraction form
   1,144.34/1,578.57 = 723.91/x
3. Step 3: Cross multiply
   1,144.34x = 1,578.57 × 723.91
4. Step 4: Simplify right side
   1,144.34x = 1,142,742.61
5. Step 5: Solve for x
   x = 1,142,742.61/1,144.34
6. Step 6: Final answer
   x = 998.60