Finding the Fourth Proportional to 105,559.20, 158,047.20 and 82,231.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,559.20 : 158,047.20 = 82,231.20 : x
2. Step 2: Convert to fraction form
   105,559.20/158,047.20 = 82,231.20/x
3. Step 3: Cross multiply
   105,559.20x = 158,047.20 × 82,231.20
4. Step 4: Simplify right side
   105,559.20x = 12,996,410,912.64
5. Step 5: Solve for x
   x = 12,996,410,912.64/105,559.20
6. Step 6: Final answer
   x = 123,119.64