Finding the Fourth Proportional to 105.56, 158.25 and 82.61

Step by Step Solution

1. Step 1: Write the proportion equation
   105.56 : 158.25 = 82.61 : x
2. Step 2: Convert to fraction form
   105.56/158.25 = 82.61/x
3. Step 3: Cross multiply
   105.56x = 158.25 × 82.61
4. Step 4: Simplify right side
   105.56x = 13,073.03
5. Step 5: Solve for x
   x = 13,073.03/105.56
6. Step 6: Final answer
   x = 123.84