Finding the Fourth Proportional to 111.42, 166.89 and 104.70

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 166.89 = 104.70 : x
2. Step 2: Convert to fraction form
   111.42/166.89 = 104.70/x
3. Step 3: Cross multiply
   111.42x = 166.89 × 104.70
4. Step 4: Simplify right side
   111.42x = 17,473.38
5. Step 5: Solve for x
   x = 17,473.38/111.42
6. Step 6: Final answer
   x = 156.82