Finding the Fourth Proportional to 111.58, 167.30 and 82.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.58 : 167.30 = 82.42 : x
2. Step 2: Convert to fraction form
   111.58/167.30 = 82.42/x
3. Step 3: Cross multiply
   111.58x = 167.30 × 82.42
4. Step 4: Simplify right side
   111.58x = 13,787.62
5. Step 5: Solve for x
   x = 13,787.62/111.58
6. Step 6: Final answer
   x = 123.57