Finding the Fourth Proportional to 89.36, 123.32 and 78.48

Step by Step Solution

1. Step 1: Write the proportion equation
   89.36 : 123.32 = 78.48 : x
2. Step 2: Convert to fraction form
   89.36/123.32 = 78.48/x
3. Step 3: Cross multiply
   89.36x = 123.32 × 78.48
4. Step 4: Simplify right side
   89.36x = 9,678.15
5. Step 5: Solve for x
   x = 9,678.15/89.36
6. Step 6: Final answer
   x = 108.31