Finding the Fourth Proportional to 105.89, 145.89 and 73.08

Step by Step Solution

1. Step 1: Write the proportion equation
   105.89 : 145.89 = 73.08 : x
2. Step 2: Convert to fraction form
   105.89/145.89 = 73.08/x
3. Step 3: Cross multiply
   105.89x = 145.89 × 73.08
4. Step 4: Simplify right side
   105.89x = 10,661.64
5. Step 5: Solve for x
   x = 10,661.64/105.89
6. Step 6: Final answer
   x = 100.69