Finding the Fourth Proportional to 111.17, 153.38 and 71.82

Step by Step Solution

1. Step 1: Write the proportion equation
   111.17 : 153.38 = 71.82 : x
2. Step 2: Convert to fraction form
   111.17/153.38 = 71.82/x
3. Step 3: Cross multiply
   111.17x = 153.38 × 71.82
4. Step 4: Simplify right side
   111.17x = 11,015.93
5. Step 5: Solve for x
   x = 11,015.93/111.17
6. Step 6: Final answer
   x = 99.09