Finding the Fourth Proportional to 111.42, 153.69 and 72.66

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.69 = 72.66 : x
2. Step 2: Convert to fraction form
   111.42/153.69 = 72.66/x
3. Step 3: Cross multiply
   111.42x = 153.69 × 72.66
4. Step 4: Simplify right side
   111.42x = 11,167.12
5. Step 5: Solve for x
   x = 11,167.12/111.42
6. Step 6: Final answer
   x = 100.23