Finding the Fourth Proportional to 111.31, 166.12 and 104.49

Step by Step Solution

1. Step 1: Write the proportion equation
   111.31 : 166.12 = 104.49 : x
2. Step 2: Convert to fraction form
   111.31/166.12 = 104.49/x
3. Step 3: Cross multiply
   111.31x = 166.12 × 104.49
4. Step 4: Simplify right side
   111.31x = 17,357.62
5. Step 5: Solve for x
   x = 17,357.62/111.31
6. Step 6: Final answer
   x = 155.94