Finding the Fourth Proportional to 86.00, 128.84 and 72.54

Step by Step Solution

1. Step 1: Write the proportion equation
   86.00 : 128.84 = 72.54 : x
2. Step 2: Convert to fraction form
   86.00/128.84 = 72.54/x
3. Step 3: Cross multiply
   86.00x = 128.84 × 72.54
4. Step 4: Simplify right side
   86.00x = 9,345.69
5. Step 5: Solve for x
   x = 9,345.69/86.00
6. Step 6: Final answer
   x = 108.68