Finding the Fourth Proportional to 111.54, 153.99 and 86.94

Step by Step Solution

1. Step 1: Write the proportion equation
   111.54 : 153.99 = 86.94 : x
2. Step 2: Convert to fraction form
   111.54/153.99 = 86.94/x
3. Step 3: Cross multiply
   111.54x = 153.99 × 86.94
4. Step 4: Simplify right side
   111.54x = 13,387.89
5. Step 5: Solve for x
   x = 13,387.89/111.54
6. Step 6: Final answer
   x = 120.03