Finding the Fourth Proportional to 111.23, 166.72 and 53.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.23 : 166.72 = 53.42 : x
2. Step 2: Convert to fraction form
   111.23/166.72 = 53.42/x
3. Step 3: Cross multiply
   111.23x = 166.72 × 53.42
4. Step 4: Simplify right side
   111.23x = 8,906.18
5. Step 5: Solve for x
   x = 8,906.18/111.23
6. Step 6: Final answer
   x = 80.07