Finding the Fourth Proportional to 111.13, 153.42 and 72.38

Step by Step Solution

1. Step 1: Write the proportion equation
   111.13 : 153.42 = 72.38 : x
2. Step 2: Convert to fraction form
   111.13/153.42 = 72.38/x
3. Step 3: Cross multiply
   111.13x = 153.42 × 72.38
4. Step 4: Simplify right side
   111.13x = 11,104.54
5. Step 5: Solve for x
   x = 11,104.54/111.13
6. Step 6: Final answer
   x = 99.92