Finding the Fourth Proportional to 86.72, 119.69 and 59.10

Step by Step Solution

1. Step 1: Write the proportion equation
   86.72 : 119.69 = 59.10 : x
2. Step 2: Convert to fraction form
   86.72/119.69 = 59.10/x
3. Step 3: Cross multiply
   86.72x = 119.69 × 59.10
4. Step 4: Simplify right side
   86.72x = 7,073.16
5. Step 5: Solve for x
   x = 7,073.16/86.72
6. Step 6: Final answer
   x = 81.56