Finding the Fourth Proportional to 111.03, 166.45 and 72.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.03 : 166.45 = 72.42 : x
2. Step 2: Convert to fraction form
   111.03/166.45 = 72.42/x
3. Step 3: Cross multiply
   111.03x = 166.45 × 72.42
4. Step 4: Simplify right side
   111.03x = 12,054.31
5. Step 5: Solve for x
   x = 12,054.31/111.03
6. Step 6: Final answer
   x = 108.57