Finding the Fourth Proportional to 105.86, 158.88 and 83.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105.86 : 158.88 = 83.28 : x
2. Step 2: Convert to fraction form
   105.86/158.88 = 83.28/x
3. Step 3: Cross multiply
   105.86x = 158.88 × 83.28
4. Step 4: Simplify right side
   105.86x = 13,231.53
5. Step 5: Solve for x
   x = 13,231.53/105.86
6. Step 6: Final answer
   x = 124.99