Finding the Fourth Proportional to 1,123.33, 1,684.94 and 392.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.33 : 1,684.94 = 392.96 : x
2. Step 2: Convert to fraction form
   1,123.33/1,684.94 = 392.96/x
3. Step 3: Cross multiply
   1,123.33x = 1,684.94 × 392.96
4. Step 4: Simplify right side
   1,123.33x = 662,114.02
5. Step 5: Solve for x
   x = 662,114.02/1,123.33
6. Step 6: Final answer
   x = 589.42