Finding the Fourth Proportional to 1,123.16, 1,550.76 and 862.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.16 : 1,550.76 = 862.88 : x
2. Step 2: Convert to fraction form
   1,123.16/1,550.76 = 862.88/x
3. Step 3: Cross multiply
   1,123.16x = 1,550.76 × 862.88
4. Step 4: Simplify right side
   1,123.16x = 1,338,119.79
5. Step 5: Solve for x
   x = 1,338,119.79/1,123.16
6. Step 6: Final answer
   x = 1,191.39