Finding the Fourth Proportional to 86.82, 119.82 and 61.57

Step by Step Solution

1. Step 1: Write the proportion equation
   86.82 : 119.82 = 61.57 : x
2. Step 2: Convert to fraction form
   86.82/119.82 = 61.57/x
3. Step 3: Cross multiply
   86.82x = 119.82 × 61.57
4. Step 4: Simplify right side
   86.82x = 7,377.32
5. Step 5: Solve for x
   x = 7,377.32/86.82
6. Step 6: Final answer
   x = 84.97