Finding the Fourth Proportional to 86.80, 118.72 and 86.48

Step by Step Solution

1. Step 1: Write the proportion equation
   86.80 : 118.72 = 86.48 : x
2. Step 2: Convert to fraction form
   86.80/118.72 = 86.48/x
3. Step 3: Cross multiply
   86.80x = 118.72 × 86.48
4. Step 4: Simplify right side
   86.80x = 10,266.91
5. Step 5: Solve for x
   x = 10,266.91/86.80
6. Step 6: Final answer
   x = 118.28