Finding the Fourth Proportional to 115.72, 159.54 and 82.00

Step by Step Solution

1. Step 1: Write the proportion equation
   115.72 : 159.54 = 82.00 : x
2. Step 2: Convert to fraction form
   115.72/159.54 = 82.00/x
3. Step 3: Cross multiply
   115.72x = 159.54 × 82.00
4. Step 4: Simplify right side
   115.72x = 13,081.48
5. Step 5: Solve for x
   x = 13,081.48/115.72
6. Step 6: Final answer
   x = 113.05