Finding the Fourth Proportional to 111.25, 166.49 and 89.53

Step by Step Solution

1. Step 1: Write the proportion equation
   111.25 : 166.49 = 89.53 : x
2. Step 2: Convert to fraction form
   111.25/166.49 = 89.53/x
3. Step 3: Cross multiply
   111.25x = 166.49 × 89.53
4. Step 4: Simplify right side
   111.25x = 14,905.85
5. Step 5: Solve for x
   x = 14,905.85/111.25
6. Step 6: Final answer
   x = 133.99