Finding the Fourth Proportional to 111.49, 153.71 and 72.08

Step by Step Solution

1. Step 1: Write the proportion equation
   111.49 : 153.71 = 72.08 : x
2. Step 2: Convert to fraction form
   111.49/153.71 = 72.08/x
3. Step 3: Cross multiply
   111.49x = 153.71 × 72.08
4. Step 4: Simplify right side
   111.49x = 11,078.85
5. Step 5: Solve for x
   x = 11,078.85/111.49
6. Step 6: Final answer
   x = 99.38