Finding the Fourth Proportional to 86.42, 119.42 and 61.82

Step by Step Solution

1. Step 1: Write the proportion equation
   86.42 : 119.42 = 61.82 : x
2. Step 2: Convert to fraction form
   86.42/119.42 = 61.82/x
3. Step 3: Cross multiply
   86.42x = 119.42 × 61.82
4. Step 4: Simplify right side
   86.42x = 7,382.32
5. Step 5: Solve for x
   x = 7,382.32/86.42
6. Step 6: Final answer
   x = 85.42