Finding the Fourth Proportional to 86.81, 119.95 and 86.00

Step by Step Solution

1. Step 1: Write the proportion equation
   86.81 : 119.95 = 86.00 : x
2. Step 2: Convert to fraction form
   86.81/119.95 = 86.00/x
3. Step 3: Cross multiply
   86.81x = 119.95 × 86.00
4. Step 4: Simplify right side
   86.81x = 10,314.89
5. Step 5: Solve for x
   x = 10,314.89/86.81
6. Step 6: Final answer
   x = 118.83