Finding the Fourth Proportional to 105.38, 145.42 and 63.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105.38 : 145.42 = 63.94 : x
2. Step 2: Convert to fraction form
   105.38/145.42 = 63.94/x
3. Step 3: Cross multiply
   105.38x = 145.42 × 63.94
4. Step 4: Simplify right side
   105.38x = 9,298.15
5. Step 5: Solve for x
   x = 9,298.15/105.38
6. Step 6: Final answer
   x = 88.23