Finding the Fourth Proportional to 105.71, 158.59 and 104.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105.71 : 158.59 = 104.12 : x
2. Step 2: Convert to fraction form
   105.71/158.59 = 104.12/x
3. Step 3: Cross multiply
   105.71x = 158.59 × 104.12
4. Step 4: Simplify right side
   105.71x = 16,512.32
5. Step 5: Solve for x
   x = 16,512.32/105.71
6. Step 6: Final answer
   x = 156.21