Finding the Fourth Proportional to 89.49, 123.59 and 84.38

Step by Step Solution

1. Step 1: Write the proportion equation
   89.49 : 123.59 = 84.38 : x
2. Step 2: Convert to fraction form
   89.49/123.59 = 84.38/x
3. Step 3: Cross multiply
   89.49x = 123.59 × 84.38
4. Step 4: Simplify right side
   89.49x = 10,428.52
5. Step 5: Solve for x
   x = 10,428.52/89.49
6. Step 6: Final answer
   x = 116.53