Finding the Fourth Proportional to 111.33, 153.57 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111.33 : 153.57 = 71.98 : x
2. Step 2: Convert to fraction form
   111.33/153.57 = 71.98/x
3. Step 3: Cross multiply
   111.33x = 153.57 × 71.98
4. Step 4: Simplify right side
   111.33x = 11,053.97
5. Step 5: Solve for x
   x = 11,053.97/111.33
6. Step 6: Final answer
   x = 99.29