Finding the Fourth Proportional to 89.57, 122.83 and 88.55

Step by Step Solution

1. Step 1: Write the proportion equation
   89.57 : 122.83 = 88.55 : x
2. Step 2: Convert to fraction form
   89.57/122.83 = 88.55/x
3. Step 3: Cross multiply
   89.57x = 122.83 × 88.55
4. Step 4: Simplify right side
   89.57x = 10,876.60
5. Step 5: Solve for x
   x = 10,876.60/89.57
6. Step 6: Final answer
   x = 121.43