Finding the Fourth Proportional to 85.29, 128.18 and 83.01

Step by Step Solution

1. Step 1: Write the proportion equation
   85.29 : 128.18 = 83.01 : x
2. Step 2: Convert to fraction form
   85.29/128.18 = 83.01/x
3. Step 3: Cross multiply
   85.29x = 128.18 × 83.01
4. Step 4: Simplify right side
   85.29x = 10,640.22
5. Step 5: Solve for x
   x = 10,640.22/85.29
6. Step 6: Final answer
   x = 124.75