Finding the Fourth Proportional to 89.28, 123.12 and 83.52

Step by Step Solution

1. Step 1: Write the proportion equation
   89.28 : 123.12 = 83.52 : x
2. Step 2: Convert to fraction form
   89.28/123.12 = 83.52/x
3. Step 3: Cross multiply
   89.28x = 123.12 × 83.52
4. Step 4: Simplify right side
   89.28x = 10,282.98
5. Step 5: Solve for x
   x = 10,282.98/89.28
6. Step 6: Final answer
   x = 115.18