Finding the Fourth Proportional to 1,123.78, 1,550.76 and 731.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.78 : 1,550.76 = 731.44 : x
2. Step 2: Convert to fraction form
   1,123.78/1,550.76 = 731.44/x
3. Step 3: Cross multiply
   1,123.78x = 1,550.76 × 731.44
4. Step 4: Simplify right side
   1,123.78x = 1,134,287.89
5. Step 5: Solve for x
   x = 1,134,287.89/1,123.78
6. Step 6: Final answer
   x = 1,009.35