Finding the Fourth Proportional to 111.18, 153.27 and 78.33

Step by Step Solution

1. Step 1: Write the proportion equation
   111.18 : 153.27 = 78.33 : x
2. Step 2: Convert to fraction form
   111.18/153.27 = 78.33/x
3. Step 3: Cross multiply
   111.18x = 153.27 × 78.33
4. Step 4: Simplify right side
   111.18x = 12,005.64
5. Step 5: Solve for x
   x = 12,005.64/111.18
6. Step 6: Final answer
   x = 107.98