Finding the Fourth Proportional to 86.58, 129.69 and 59.52

Step by Step Solution

1. Step 1: Write the proportion equation
   86.58 : 129.69 = 59.52 : x
2. Step 2: Convert to fraction form
   86.58/129.69 = 59.52/x
3. Step 3: Cross multiply
   86.58x = 129.69 × 59.52
4. Step 4: Simplify right side
   86.58x = 7,719.15
5. Step 5: Solve for x
   x = 7,719.15/86.58
6. Step 6: Final answer
   x = 89.16