Finding the Fourth Proportional to 82.05, 113.24 and 49.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.05 : 113.24 = 49.31 : x
2. Step 2: Convert to fraction form
   82.05/113.24 = 49.31/x
3. Step 3: Cross multiply
   82.05x = 113.24 × 49.31
4. Step 4: Simplify right side
   82.05x = 5,583.86
5. Step 5: Solve for x
   x = 5,583.86/82.05
6. Step 6: Final answer
   x = 68.05