Finding the Fourth Proportional to 111.69, 167.38 and 57.47

Step by Step Solution

1. Step 1: Write the proportion equation
   111.69 : 167.38 = 57.47 : x
2. Step 2: Convert to fraction form
   111.69/167.38 = 57.47/x
3. Step 3: Cross multiply
   111.69x = 167.38 × 57.47
4. Step 4: Simplify right side
   111.69x = 9,619.33
5. Step 5: Solve for x
   x = 9,619.33/111.69
6. Step 6: Final answer
   x = 86.13