Finding the Fourth Proportional to 111.42, 166.56 and 84.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 166.56 = 84.42 : x
2. Step 2: Convert to fraction form
   111.42/166.56 = 84.42/x
3. Step 3: Cross multiply
   111.42x = 166.56 × 84.42
4. Step 4: Simplify right side
   111.42x = 14,061.00
5. Step 5: Solve for x
   x = 14,061.00/111.42
6. Step 6: Final answer
   x = 126.20