Finding the Fourth Proportional to 109.10, 163.83 and 105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109.10 : 163.83 = 105.50 : x
2. Step 2: Convert to fraction form
   109.10/163.83 = 105.50/x
3. Step 3: Cross multiply
   109.10x = 163.83 × 105.50
4. Step 4: Simplify right side
   109.10x = 17,284.07
5. Step 5: Solve for x
   x = 17,284.07/109.10
6. Step 6: Final answer
   x = 158.42