Finding the Fourth Proportional to 111.24, 153.54 and 69.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111.24 : 153.54 = 69.78 : x
2. Step 2: Convert to fraction form
   111.24/153.54 = 69.78/x
3. Step 3: Cross multiply
   111.24x = 153.54 × 69.78
4. Step 4: Simplify right side
   111.24x = 10,714.02
5. Step 5: Solve for x
   x = 10,714.02/111.24
6. Step 6: Final answer
   x = 96.31