Finding the Fourth Proportional to 105.41, 158.12 and 105.21

Step by Step Solution

1. Step 1: Write the proportion equation
   105.41 : 158.12 = 105.21 : x
2. Step 2: Convert to fraction form
   105.41/158.12 = 105.21/x
3. Step 3: Cross multiply
   105.41x = 158.12 × 105.21
4. Step 4: Simplify right side
   105.41x = 16,635.81
5. Step 5: Solve for x
   x = 16,635.81/105.41
6. Step 6: Final answer
   x = 157.82