Finding the Fourth Proportional to 86.79, 119.00 and 85.25

Step by Step Solution

1. Step 1: Write the proportion equation
   86.79 : 119.00 = 85.25 : x
2. Step 2: Convert to fraction form
   86.79/119.00 = 85.25/x
3. Step 3: Cross multiply
   86.79x = 119.00 × 85.25
4. Step 4: Simplify right side
   86.79x = 10,143.73
5. Step 5: Solve for x
   x = 10,143.73/86.79
6. Step 6: Final answer
   x = 116.88