Finding the Fourth Proportional to 111.10, 166.56 and 53.28

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 166.56 = 53.28 : x
2. Step 2: Convert to fraction form
   111.10/166.56 = 53.28/x
3. Step 3: Cross multiply
   111.10x = 166.56 × 53.28
4. Step 4: Simplify right side
   111.10x = 8,874.32
5. Step 5: Solve for x
   x = 8,874.32/111.10
6. Step 6: Final answer
   x = 79.88