Finding the Fourth Proportional to 111.23, 153.53 and 78.05

Step by Step Solution

1. Step 1: Write the proportion equation
   111.23 : 153.53 = 78.05 : x
2. Step 2: Convert to fraction form
   111.23/153.53 = 78.05/x
3. Step 3: Cross multiply
   111.23x = 153.53 × 78.05
4. Step 4: Simplify right side
   111.23x = 11,983.02
5. Step 5: Solve for x
   x = 11,983.02/111.23
6. Step 6: Final answer
   x = 107.73