Finding the Fourth Proportional to 111.56, 167.34 and 53.81

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 167.34 = 53.81 : x
2. Step 2: Convert to fraction form
   111.56/167.34 = 53.81/x
3. Step 3: Cross multiply
   111.56x = 167.34 × 53.81
4. Step 4: Simplify right side
   111.56x = 9,003.73
5. Step 5: Solve for x
   x = 9,003.73/111.56
6. Step 6: Final answer
   x = 80.71