Finding the Fourth Proportional to 111.01, 166.33 and 53.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.01 : 166.33 = 53.10 : x
2. Step 2: Convert to fraction form
   111.01/166.33 = 53.10/x
3. Step 3: Cross multiply
   111.01x = 166.33 × 53.10
4. Step 4: Simplify right side
   111.01x = 8,831.03
5. Step 5: Solve for x
   x = 8,831.03/111.01
6. Step 6: Final answer
   x = 79.55