Finding the Fourth Proportional to 111.04, 153.24 and 71.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.04 : 153.24 = 71.72 : x
2. Step 2: Convert to fraction form
   111.04/153.24 = 71.72/x
3. Step 3: Cross multiply
   111.04x = 153.24 × 71.72
4. Step 4: Simplify right side
   111.04x = 10,990.37
5. Step 5: Solve for x
   x = 10,990.37/111.04
6. Step 6: Final answer
   x = 98.98