Finding the Fourth Proportional to 116.24, 160.32 and 86.72

Step by Step Solution

1. Step 1: Write the proportion equation
   116.24 : 160.32 = 86.72 : x
2. Step 2: Convert to fraction form
   116.24/160.32 = 86.72/x
3. Step 3: Cross multiply
   116.24x = 160.32 × 86.72
4. Step 4: Simplify right side
   116.24x = 13,902.95
5. Step 5: Solve for x
   x = 13,902.95/116.24
6. Step 6: Final answer
   x = 119.61