Finding the Fourth Proportional to 111.82, 154.22 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   111.82 : 154.22 = 72.48 : x
2. Step 2: Convert to fraction form
   111.82/154.22 = 72.48/x
3. Step 3: Cross multiply
   111.82x = 154.22 × 72.48
4. Step 4: Simplify right side
   111.82x = 11,177.87
5. Step 5: Solve for x
   x = 11,177.87/111.82
6. Step 6: Final answer
   x = 99.96