Finding the Fourth Proportional to 86.82, 119.82 and 64.98

Step by Step Solution

1. Step 1: Write the proportion equation
   86.82 : 119.82 = 64.98 : x
2. Step 2: Convert to fraction form
   86.82/119.82 = 64.98/x
3. Step 3: Cross multiply
   86.82x = 119.82 × 64.98
4. Step 4: Simplify right side
   86.82x = 7,785.90
5. Step 5: Solve for x
   x = 7,785.90/86.82
6. Step 6: Final answer
   x = 89.68