Finding the Fourth Proportional to 111.77, 167.49 and 57.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.77 : 167.49 = 57.69 : x
2. Step 2: Convert to fraction form
   111.77/167.49 = 57.69/x
3. Step 3: Cross multiply
   111.77x = 167.49 × 57.69
4. Step 4: Simplify right side
   111.77x = 9,662.50
5. Step 5: Solve for x
   x = 9,662.50/111.77
6. Step 6: Final answer
   x = 86.45