Finding the Fourth Proportional to 89.39, 122.41 and 89.09

Step by Step Solution

1. Step 1: Write the proportion equation
   89.39 : 122.41 = 89.09 : x
2. Step 2: Convert to fraction form
   89.39/122.41 = 89.09/x
3. Step 3: Cross multiply
   89.39x = 122.41 × 89.09
4. Step 4: Simplify right side
   89.39x = 10,905.51
5. Step 5: Solve for x
   x = 10,905.51/89.39
6. Step 6: Final answer
   x = 122.00