Finding the Fourth Proportional to 105.75, 145.71 and 103.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105.75 : 145.71 = 103.05 : x
2. Step 2: Convert to fraction form
   105.75/145.71 = 103.05/x
3. Step 3: Cross multiply
   105.75x = 145.71 × 103.05
4. Step 4: Simplify right side
   105.75x = 15,015.42
5. Step 5: Solve for x
   x = 15,015.42/105.75
6. Step 6: Final answer
   x = 141.99