Finding the Fourth Proportional to 105.01, 145.28 and 89.41

Step by Step Solution

1. Step 1: Write the proportion equation
   105.01 : 145.28 = 89.41 : x
2. Step 2: Convert to fraction form
   105.01/145.28 = 89.41/x
3. Step 3: Cross multiply
   105.01x = 145.28 × 89.41
4. Step 4: Simplify right side
   105.01x = 12,989.48
5. Step 5: Solve for x
   x = 12,989.48/105.01
6. Step 6: Final answer
   x = 123.70