Finding the Fourth Proportional to 1,123.62, 1,685.48 and 393.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.62 : 1,685.48 = 393.27 : x
2. Step 2: Convert to fraction form
   1,123.62/1,685.48 = 393.27/x
3. Step 3: Cross multiply
   1,123.62x = 1,685.48 × 393.27
4. Step 4: Simplify right side
   1,123.62x = 662,848.72
5. Step 5: Solve for x
   x = 662,848.72/1,123.62
6. Step 6: Final answer
   x = 589.92