Finding the Fourth Proportional to 111.10, 153.30 and 66.82

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 153.30 = 66.82 : x
2. Step 2: Convert to fraction form
   111.10/153.30 = 66.82/x
3. Step 3: Cross multiply
   111.10x = 153.30 × 66.82
4. Step 4: Simplify right side
   111.10x = 10,243.51
5. Step 5: Solve for x
   x = 10,243.51/111.10
6. Step 6: Final answer
   x = 92.20