Finding the Fourth Proportional to 89.68, 123.69 and 65.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89.68 : 123.69 = 65.20 : x
2. Step 2: Convert to fraction form
   89.68/123.69 = 65.20/x
3. Step 3: Cross multiply
   89.68x = 123.69 × 65.20
4. Step 4: Simplify right side
   89.68x = 8,064.59
5. Step 5: Solve for x
   x = 8,064.59/89.68
6. Step 6: Final answer
   x = 89.93