Finding the Fourth Proportional to 1,123.75, 1,685.50 and 393.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.75 : 1,685.50 = 393.33 : x
2. Step 2: Convert to fraction form
   1,123.75/1,685.50 = 393.33/x
3. Step 3: Cross multiply
   1,123.75x = 1,685.50 × 393.33
4. Step 4: Simplify right side
   1,123.75x = 662,957.72
5. Step 5: Solve for x
   x = 662,957.72/1,123.75
6. Step 6: Final answer
   x = 589.95