Finding the Fourth Proportional to 111.77, 155.31 and 110.66

Step by Step Solution

1. Step 1: Write the proportion equation
   111.77 : 155.31 = 110.66 : x
2. Step 2: Convert to fraction form
   111.77/155.31 = 110.66/x
3. Step 3: Cross multiply
   111.77x = 155.31 × 110.66
4. Step 4: Simplify right side
   111.77x = 17,185.83
5. Step 5: Solve for x
   x = 17,185.83/111.77
6. Step 6: Final answer
   x = 153.77