Finding the Fourth Proportional to 111.08, 153.38 and 76.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.08 : 153.38 = 76.15 : x
2. Step 2: Convert to fraction form
   111.08/153.38 = 76.15/x
3. Step 3: Cross multiply
   111.08x = 153.38 × 76.15
4. Step 4: Simplify right side
   111.08x = 11,680.27
5. Step 5: Solve for x
   x = 11,680.27/111.08
6. Step 6: Final answer
   x = 105.15