Finding the Fourth Proportional to 111.15, 153.33 and 76.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111.15 : 153.33 = 76.12 : x
2. Step 2: Convert to fraction form
   111.15/153.33 = 76.12/x
3. Step 3: Cross multiply
   111.15x = 153.33 × 76.12
4. Step 4: Simplify right side
   111.15x = 11,670.81
5. Step 5: Solve for x
   x = 11,670.81/111.15
6. Step 6: Final answer
   x = 105.00