Finding the Fourth Proportional to 1,123.22, 1,684.52 and 392.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.22 : 1,684.52 = 392.42 : x
2. Step 2: Convert to fraction form
   1,123.22/1,684.52 = 392.42/x
3. Step 3: Cross multiply
   1,123.22x = 1,684.52 × 392.42
4. Step 4: Simplify right side
   1,123.22x = 661,039.34
5. Step 5: Solve for x
   x = 661,039.34/1,123.22
6. Step 6: Final answer
   x = 588.52