Finding the Fourth Proportional to 89.69, 123.35 and 82.85

Step by Step Solution

1. Step 1: Write the proportion equation
   89.69 : 123.35 = 82.85 : x
2. Step 2: Convert to fraction form
   89.69/123.35 = 82.85/x
3. Step 3: Cross multiply
   89.69x = 123.35 × 82.85
4. Step 4: Simplify right side
   89.69x = 10,219.55
5. Step 5: Solve for x
   x = 10,219.55/89.69
6. Step 6: Final answer
   x = 113.95