Finding the Fourth Proportional to 111.29, 153.59 and 69.85

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 153.59 = 69.85 : x
2. Step 2: Convert to fraction form
   111.29/153.59 = 69.85/x
3. Step 3: Cross multiply
   111.29x = 153.59 × 69.85
4. Step 4: Simplify right side
   111.29x = 10,728.26
5. Step 5: Solve for x
   x = 10,728.26/111.29
6. Step 6: Final answer
   x = 96.40