Finding the Fourth Proportional to 105.27, 145.41 and 74.17

Step by Step Solution

1. Step 1: Write the proportion equation
   105.27 : 145.41 = 74.17 : x
2. Step 2: Convert to fraction form
   105.27/145.41 = 74.17/x
3. Step 3: Cross multiply
   105.27x = 145.41 × 74.17
4. Step 4: Simplify right side
   105.27x = 10,784.33
5. Step 5: Solve for x
   x = 10,784.33/105.27
6. Step 6: Final answer
   x = 102.44