Finding the Fourth Proportional to 89.50, 123.42 and 67.64

Step by Step Solution

1. Step 1: Write the proportion equation
   89.50 : 123.42 = 67.64 : x
2. Step 2: Convert to fraction form
   89.50/123.42 = 67.64/x
3. Step 3: Cross multiply
   89.50x = 123.42 × 67.64
4. Step 4: Simplify right side
   89.50x = 8,348.13
5. Step 5: Solve for x
   x = 8,348.13/89.50
6. Step 6: Final answer
   x = 93.28