Finding the Fourth Proportional to 111.29, 153.23 and 89.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 153.23 = 89.42 : x
2. Step 2: Convert to fraction form
   111.29/153.23 = 89.42/x
3. Step 3: Cross multiply
   111.29x = 153.23 × 89.42
4. Step 4: Simplify right side
   111.29x = 13,700.61
5. Step 5: Solve for x
   x = 13,700.61/111.29
6. Step 6: Final answer
   x = 123.11