Finding the Fourth Proportional to 89.28, 123.28 and 83.08

Step by Step Solution

1. Step 1: Write the proportion equation
   89.28 : 123.28 = 83.08 : x
2. Step 2: Convert to fraction form
   89.28/123.28 = 83.08/x
3. Step 3: Cross multiply
   89.28x = 123.28 × 83.08
4. Step 4: Simplify right side
   89.28x = 10,242.10
5. Step 5: Solve for x
   x = 10,242.10/89.28
6. Step 6: Final answer
   x = 114.72