Finding the Fourth Proportional to 111.35, 166.73 and 100.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.35 : 166.73 = 100.42 : x
2. Step 2: Convert to fraction form
   111.35/166.73 = 100.42/x
3. Step 3: Cross multiply
   111.35x = 166.73 × 100.42
4. Step 4: Simplify right side
   111.35x = 16,742.11
5. Step 5: Solve for x
   x = 16,742.11/111.35
6. Step 6: Final answer
   x = 150.35