Finding the Fourth Proportional to 105.27, 145.18 and 67.87

Step by Step Solution

1. Step 1: Write the proportion equation
   105.27 : 145.18 = 67.87 : x
2. Step 2: Convert to fraction form
   105.27/145.18 = 67.87/x
3. Step 3: Cross multiply
   105.27x = 145.18 × 67.87
4. Step 4: Simplify right side
   105.27x = 9,853.37
5. Step 5: Solve for x
   x = 9,853.37/105.27
6. Step 6: Final answer
   x = 93.60