Finding the Fourth Proportional to 111.80, 167.52 and 57.71

Step by Step Solution

1. Step 1: Write the proportion equation
   111.80 : 167.52 = 57.71 : x
2. Step 2: Convert to fraction form
   111.80/167.52 = 57.71/x
3. Step 3: Cross multiply
   111.80x = 167.52 × 57.71
4. Step 4: Simplify right side
   111.80x = 9,667.58
5. Step 5: Solve for x
   x = 9,667.58/111.80
6. Step 6: Final answer
   x = 86.47