Finding the Fourth Proportional to 111.18, 165.77 and 108.38

Step by Step Solution

1. Step 1: Write the proportion equation
   111.18 : 165.77 = 108.38 : x
2. Step 2: Convert to fraction form
   111.18/165.77 = 108.38/x
3. Step 3: Cross multiply
   111.18x = 165.77 × 108.38
4. Step 4: Simplify right side
   111.18x = 17,965.61
5. Step 5: Solve for x
   x = 17,965.61/111.18
6. Step 6: Final answer
   x = 161.59