Finding the Fourth Proportional to 105.47, 145.46 and 89.97

Step by Step Solution

1. Step 1: Write the proportion equation
   105.47 : 145.46 = 89.97 : x
2. Step 2: Convert to fraction form
   105.47/145.46 = 89.97/x
3. Step 3: Cross multiply
   105.47x = 145.46 × 89.97
4. Step 4: Simplify right side
   105.47x = 13,086.59
5. Step 5: Solve for x
   x = 13,086.59/105.47
6. Step 6: Final answer
   x = 124.08