Finding the Fourth Proportional to 111.18, 153.54 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   111.18 : 153.54 = 72.48 : x
2. Step 2: Convert to fraction form
   111.18/153.54 = 72.48/x
3. Step 3: Cross multiply
   111.18x = 153.54 × 72.48
4. Step 4: Simplify right side
   111.18x = 11,128.58
5. Step 5: Solve for x
   x = 11,128.58/111.18
6. Step 6: Final answer
   x = 100.10