Finding the Fourth Proportional to 111.24, 153.50 and 71.89

Step by Step Solution

1. Step 1: Write the proportion equation
   111.24 : 153.50 = 71.89 : x
2. Step 2: Convert to fraction form
   111.24/153.50 = 71.89/x
3. Step 3: Cross multiply
   111.24x = 153.50 × 71.89
4. Step 4: Simplify right side
   111.24x = 11,034.37
5. Step 5: Solve for x
   x = 11,034.37/111.24
6. Step 6: Final answer
   x = 99.19