Finding the Fourth Proportional to 89.50, 123.56 and 63.68

Step by Step Solution

1. Step 1: Write the proportion equation
   89.50 : 123.56 = 63.68 : x
2. Step 2: Convert to fraction form
   89.50/123.56 = 63.68/x
3. Step 3: Cross multiply
   89.50x = 123.56 × 63.68
4. Step 4: Simplify right side
   89.50x = 7,868.30
5. Step 5: Solve for x
   x = 7,868.30/89.50
6. Step 6: Final answer
   x = 87.91