Finding the Fourth Proportional to 1,123.16, 1,549.12 and 791.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.16 : 1,549.12 = 791.24 : x
2. Step 2: Convert to fraction form
   1,123.16/1,549.12 = 791.24/x
3. Step 3: Cross multiply
   1,123.16x = 1,549.12 × 791.24
4. Step 4: Simplify right side
   1,123.16x = 1,225,725.71
5. Step 5: Solve for x
   x = 1,225,725.71/1,123.16
6. Step 6: Final answer
   x = 1,091.32