Finding the Fourth Proportional to 85.59, 128.34 and 34.25

Step by Step Solution

1. Step 1: Write the proportion equation
   85.59 : 128.34 = 34.25 : x
2. Step 2: Convert to fraction form
   85.59/128.34 = 34.25/x
3. Step 3: Cross multiply
   85.59x = 128.34 × 34.25
4. Step 4: Simplify right side
   85.59x = 4,395.00
5. Step 5: Solve for x
   x = 4,395.00/85.59
6. Step 6: Final answer
   x = 51.35