Finding the Fourth Proportional to 1,123.50, 1,685.33 and 354

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.50 : 1,685.33 = 354 : x
2. Step 2: Convert to fraction form
   1,123.50/1,685.33 = 354/x
3. Step 3: Cross multiply
   1,123.50x = 1,685.33 × 354
4. Step 4: Simplify right side
   1,123.50x = 596,605.05
5. Step 5: Solve for x
   x = 596,605.05/1,123.50
6. Step 6: Final answer
   x = 531.02