Finding the Fourth Proportional to 86.81, 119.73 and 59.15

Step by Step Solution

1. Step 1: Write the proportion equation
   86.81 : 119.73 = 59.15 : x
2. Step 2: Convert to fraction form
   86.81/119.73 = 59.15/x
3. Step 3: Cross multiply
   86.81x = 119.73 × 59.15
4. Step 4: Simplify right side
   86.81x = 7,082.03
5. Step 5: Solve for x
   x = 7,082.03/86.81
6. Step 6: Final answer
   x = 81.58