Finding the Fourth Proportional to 1,123.10, 1,685.50 and 575.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.10 : 1,685.50 = 575.23 : x
2. Step 2: Convert to fraction form
   1,123.10/1,685.50 = 575.23/x
3. Step 3: Cross multiply
   1,123.10x = 1,685.50 × 575.23
4. Step 4: Simplify right side
   1,123.10x = 969,550.17
5. Step 5: Solve for x
   x = 969,550.17/1,123.10
6. Step 6: Final answer
   x = 863.28