Finding the Fourth Proportional to 89.35, 122.82 and 78.94

Step by Step Solution

1. Step 1: Write the proportion equation
   89.35 : 122.82 = 78.94 : x
2. Step 2: Convert to fraction form
   89.35/122.82 = 78.94/x
3. Step 3: Cross multiply
   89.35x = 122.82 × 78.94
4. Step 4: Simplify right side
   89.35x = 9,694.75
5. Step 5: Solve for x
   x = 9,694.75/89.35
6. Step 6: Final answer
   x = 108.50