Finding the Fourth Proportional to 86.08, 128.29 and 83.59

Step by Step Solution

1. Step 1: Write the proportion equation
   86.08 : 128.29 = 83.59 : x
2. Step 2: Convert to fraction form
   86.08/128.29 = 83.59/x
3. Step 3: Cross multiply
   86.08x = 128.29 × 83.59
4. Step 4: Simplify right side
   86.08x = 10,723.76
5. Step 5: Solve for x
   x = 10,723.76/86.08
6. Step 6: Final answer
   x = 124.58