Finding the Fourth Proportional to 89.69, 123.57 and 65.07

Step by Step Solution

1. Step 1: Write the proportion equation
   89.69 : 123.57 = 65.07 : x
2. Step 2: Convert to fraction form
   89.69/123.57 = 65.07/x
3. Step 3: Cross multiply
   89.69x = 123.57 × 65.07
4. Step 4: Simplify right side
   89.69x = 8,040.70
5. Step 5: Solve for x
   x = 8,040.70/89.69
6. Step 6: Final answer
   x = 89.65