Finding the Fourth Proportional to 89.67, 123.36 and 78.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89.67 : 123.36 = 78.56 : x
2. Step 2: Convert to fraction form
   89.67/123.36 = 78.56/x
3. Step 3: Cross multiply
   89.67x = 123.36 × 78.56
4. Step 4: Simplify right side
   89.67x = 9,690.25
5. Step 5: Solve for x
   x = 9,690.25/89.67
6. Step 6: Final answer
   x = 108.07