Finding the Fourth Proportional to 86.76, 119.72 and 49.42

Step by Step Solution

1. Step 1: Write the proportion equation
   86.76 : 119.72 = 49.42 : x
2. Step 2: Convert to fraction form
   86.76/119.72 = 49.42/x
3. Step 3: Cross multiply
   86.76x = 119.72 × 49.42
4. Step 4: Simplify right side
   86.76x = 5,916.56
5. Step 5: Solve for x
   x = 5,916.56/86.76
6. Step 6: Final answer
   x = 68.19