Finding the Fourth Proportional to 105.73, 158.31 and 82.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105.73 : 158.31 = 82.76 : x
2. Step 2: Convert to fraction form
   105.73/158.31 = 82.76/x
3. Step 3: Cross multiply
   105.73x = 158.31 × 82.76
4. Step 4: Simplify right side
   105.73x = 13,100.94
5. Step 5: Solve for x
   x = 13,100.94/105.73
6. Step 6: Final answer
   x = 123.91