Finding the Fourth Proportional to 113.67, 156.72 and 82.56

Step by Step Solution

1. Step 1: Write the proportion equation
   113.67 : 156.72 = 82.56 : x
2. Step 2: Convert to fraction form
   113.67/156.72 = 82.56/x
3. Step 3: Cross multiply
   113.67x = 156.72 × 82.56
4. Step 4: Simplify right side
   113.67x = 12,938.80
5. Step 5: Solve for x
   x = 12,938.80/113.67
6. Step 6: Final answer
   x = 113.83