Finding the Fourth Proportional to 269.72, 404.63 and 105.18

Step by Step Solution

1. Step 1: Write the proportion equation
   269.72 : 404.63 = 105.18 : x
2. Step 2: Convert to fraction form
   269.72/404.63 = 105.18/x
3. Step 3: Cross multiply
   269.72x = 404.63 × 105.18
4. Step 4: Simplify right side
   269.72x = 42,556.43
5. Step 5: Solve for x
   x = 42,556.43/269.72
6. Step 6: Final answer
   x = 157.78