Finding the Fourth Proportional to 111.08, 153.24 and 89.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111.08 : 153.24 = 89.30 : x
2. Step 2: Convert to fraction form
   111.08/153.24 = 89.30/x
3. Step 3: Cross multiply
   111.08x = 153.24 × 89.30
4. Step 4: Simplify right side
   111.08x = 13,684.33
5. Step 5: Solve for x
   x = 13,684.33/111.08
6. Step 6: Final answer
   x = 123.19