Finding the Fourth Proportional to 89.08, 123.17 and 78.82

Step by Step Solution

1. Step 1: Write the proportion equation
   89.08 : 123.17 = 78.82 : x
2. Step 2: Convert to fraction form
   89.08/123.17 = 78.82/x
3. Step 3: Cross multiply
   89.08x = 123.17 × 78.82
4. Step 4: Simplify right side
   89.08x = 9,707.87
5. Step 5: Solve for x
   x = 9,707.87/89.08
6. Step 6: Final answer
   x = 108.98