Finding the Fourth Proportional to 86.39, 129.72 and 59.33

Step by Step Solution

1. Step 1: Write the proportion equation
   86.39 : 129.72 = 59.33 : x
2. Step 2: Convert to fraction form
   86.39/129.72 = 59.33/x
3. Step 3: Cross multiply
   86.39x = 129.72 × 59.33
4. Step 4: Simplify right side
   86.39x = 7,695.64
5. Step 5: Solve for x
   x = 7,695.64/86.39
6. Step 6: Final answer
   x = 89.09