Finding the Fourth Proportional to 105.69, 145.89 and 73.11

Step by Step Solution

1. Step 1: Write the proportion equation
   105.69 : 145.89 = 73.11 : x
2. Step 2: Convert to fraction form
   105.69/145.89 = 73.11/x
3. Step 3: Cross multiply
   105.69x = 145.89 × 73.11
4. Step 4: Simplify right side
   105.69x = 10,666.02
5. Step 5: Solve for x
   x = 10,666.02/105.69
6. Step 6: Final answer
   x = 100.92