Finding the Fourth Proportional to 111.33, 153.41 and 78.53

Step by Step Solution

1. Step 1: Write the proportion equation
   111.33 : 153.41 = 78.53 : x
2. Step 2: Convert to fraction form
   111.33/153.41 = 78.53/x
3. Step 3: Cross multiply
   111.33x = 153.41 × 78.53
4. Step 4: Simplify right side
   111.33x = 12,046.13
5. Step 5: Solve for x
   x = 12,046.13/111.33
6. Step 6: Final answer
   x = 108.20