Finding the Fourth Proportional to 86.67, 119.61 and 59.10

Step by Step Solution

1. Step 1: Write the proportion equation
   86.67 : 119.61 = 59.10 : x
2. Step 2: Convert to fraction form
   86.67/119.61 = 59.10/x
3. Step 3: Cross multiply
   86.67x = 119.61 × 59.10
4. Step 4: Simplify right side
   86.67x = 7,068.06
5. Step 5: Solve for x
   x = 7,068.06/86.67
6. Step 6: Final answer
   x = 81.56