Finding the Fourth Proportional to 89.10, 122.72 and 82.22

Step by Step Solution

1. Step 1: Write the proportion equation
   89.10 : 122.72 = 82.22 : x
2. Step 2: Convert to fraction form
   89.10/122.72 = 82.22/x
3. Step 3: Cross multiply
   89.10x = 122.72 × 82.22
4. Step 4: Simplify right side
   89.10x = 10,089.01
5. Step 5: Solve for x
   x = 10,089.01/89.10
6. Step 6: Final answer
   x = 113.23