Finding the Fourth Proportional to 111.35, 153.59 and 76.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.35 : 153.59 = 76.31 : x
2. Step 2: Convert to fraction form
   111.35/153.59 = 76.31/x
3. Step 3: Cross multiply
   111.35x = 153.59 × 76.31
4. Step 4: Simplify right side
   111.35x = 11,719.30
5. Step 5: Solve for x
   x = 11,719.30/111.35
6. Step 6: Final answer
   x = 105.25