Finding the Fourth Proportional to 111.82, 153.96 and 87.22

Step by Step Solution

1. Step 1: Write the proportion equation
   111.82 : 153.96 = 87.22 : x
2. Step 2: Convert to fraction form
   111.82/153.96 = 87.22/x
3. Step 3: Cross multiply
   111.82x = 153.96 × 87.22
4. Step 4: Simplify right side
   111.82x = 13,428.39
5. Step 5: Solve for x
   x = 13,428.39/111.82
6. Step 6: Final answer
   x = 120.09