Finding the Fourth Proportional to 86.82, 119.61 and 72.24

Step by Step Solution

1. Step 1: Write the proportion equation
   86.82 : 119.61 = 72.24 : x
2. Step 2: Convert to fraction form
   86.82/119.61 = 72.24/x
3. Step 3: Cross multiply
   86.82x = 119.61 × 72.24
4. Step 4: Simplify right side
   86.82x = 8,640.63
5. Step 5: Solve for x
   x = 8,640.63/86.82
6. Step 6: Final answer
   x = 99.52