Finding the Fourth Proportional to 86.69, 119.61 and 59.09

Step by Step Solution

1. Step 1: Write the proportion equation
   86.69 : 119.61 = 59.09 : x
2. Step 2: Convert to fraction form
   86.69/119.61 = 59.09/x
3. Step 3: Cross multiply
   86.69x = 119.61 × 59.09
4. Step 4: Simplify right side
   86.69x = 7,067.75
5. Step 5: Solve for x
   x = 7,067.75/86.69
6. Step 6: Final answer
   x = 81.53