Finding the Fourth Proportional to 86.72, 119.67 and 49.89

Step by Step Solution

1. Step 1: Write the proportion equation
   86.72 : 119.67 = 49.89 : x
2. Step 2: Convert to fraction form
   86.72/119.67 = 49.89/x
3. Step 3: Cross multiply
   86.72x = 119.67 × 49.89
4. Step 4: Simplify right side
   86.72x = 5,970.34
5. Step 5: Solve for x
   x = 5,970.34/86.72
6. Step 6: Final answer
   x = 68.85