Finding the Fourth Proportional to 82.18, 113.38 and 49.42

Step by Step Solution

1. Step 1: Write the proportion equation
   82.18 : 113.38 = 49.42 : x
2. Step 2: Convert to fraction form
   82.18/113.38 = 49.42/x
3. Step 3: Cross multiply
   82.18x = 113.38 × 49.42
4. Step 4: Simplify right side
   82.18x = 5,602.43
5. Step 5: Solve for x
   x = 5,602.43/82.18
6. Step 6: Final answer
   x = 68.18