Finding the Fourth Proportional to 8,081.56, 12,127.92 and 5,309.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.56 : 12,127.92 = 5,309.56 : x
2. Step 2: Convert to fraction form
   8,081.56/12,127.92 = 5,309.56/x
3. Step 3: Cross multiply
   8,081.56x = 12,127.92 × 5,309.56
4. Step 4: Simplify right side
   8,081.56x = 64,393,918.92
5. Step 5: Solve for x
   x = 64,393,918.92/8,081.56
6. Step 6: Final answer
   x = 7,968.01