Finding the Fourth Proportional to 111.48, 153.86 and 72.16

Step by Step Solution

1. Step 1: Write the proportion equation
   111.48 : 153.86 = 72.16 : x
2. Step 2: Convert to fraction form
   111.48/153.86 = 72.16/x
3. Step 3: Cross multiply
   111.48x = 153.86 × 72.16
4. Step 4: Simplify right side
   111.48x = 11,102.54
5. Step 5: Solve for x
   x = 11,102.54/111.48
6. Step 6: Final answer
   x = 99.59