Finding the Fourth Proportional to 105.25, 145.39 and 89.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105.25 : 145.39 = 89.05 : x
2. Step 2: Convert to fraction form
   105.25/145.39 = 89.05/x
3. Step 3: Cross multiply
   105.25x = 145.39 × 89.05
4. Step 4: Simplify right side
   105.25x = 12,946.17
5. Step 5: Solve for x
   x = 12,946.17/105.25
6. Step 6: Final answer
   x = 123.01