Finding the Fourth Proportional to 321.83, 482.69 and 105.38

Step by Step Solution

1. Step 1: Write the proportion equation
   321.83 : 482.69 = 105.38 : x
2. Step 2: Convert to fraction form
   321.83/482.69 = 105.38/x
3. Step 3: Cross multiply
   321.83x = 482.69 × 105.38
4. Step 4: Simplify right side
   321.83x = 50,863.72
5. Step 5: Solve for x
   x = 50,863.72/321.83
6. Step 6: Final answer
   x = 158.05