Finding the Fourth Proportional to 85.48, 128.46 and 83.04

Step by Step Solution

1. Step 1: Write the proportion equation
   85.48 : 128.46 = 83.04 : x
2. Step 2: Convert to fraction form
   85.48/128.46 = 83.04/x
3. Step 3: Cross multiply
   85.48x = 128.46 × 83.04
4. Step 4: Simplify right side
   85.48x = 10,667.32
5. Step 5: Solve for x
   x = 10,667.32/85.48
6. Step 6: Final answer
   x = 124.79