Finding the Fourth Proportional to 105.71, 158.56 and 82.62

Step by Step Solution

1. Step 1: Write the proportion equation
   105.71 : 158.56 = 82.62 : x
2. Step 2: Convert to fraction form
   105.71/158.56 = 82.62/x
3. Step 3: Cross multiply
   105.71x = 158.56 × 82.62
4. Step 4: Simplify right side
   105.71x = 13,100.02
5. Step 5: Solve for x
   x = 13,100.02/105.71
6. Step 6: Final answer
   x = 123.93