Finding the Fourth Proportional to 111.34, 167.34 and 92.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111.34 : 167.34 = 92.20 : x
2. Step 2: Convert to fraction form
   111.34/167.34 = 92.20/x
3. Step 3: Cross multiply
   111.34x = 167.34 × 92.20
4. Step 4: Simplify right side
   111.34x = 15,429.27
5. Step 5: Solve for x
   x = 15,429.27/111.34
6. Step 6: Final answer
   x = 138.58