Finding the Fourth Proportional to 105.38, 145.42 and 73.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105.38 : 145.42 = 73.92 : x
2. Step 2: Convert to fraction form
   105.38/145.42 = 73.92/x
3. Step 3: Cross multiply
   105.38x = 145.42 × 73.92
4. Step 4: Simplify right side
   105.38x = 10,748.72
5. Step 5: Solve for x
   x = 10,748.72/105.38
6. Step 6: Final answer
   x = 102.00