Finding the Fourth Proportional to 111.50, 167.34 and 54.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 167.34 = 54.50 : x
2. Step 2: Convert to fraction form
   111.50/167.34 = 54.50/x
3. Step 3: Cross multiply
   111.50x = 167.34 × 54.50
4. Step 4: Simplify right side
   111.50x = 9,120.03
5. Step 5: Solve for x
   x = 9,120.03/111.50
6. Step 6: Final answer
   x = 81.79