Finding the Fourth Proportional to 8,960.09, 12,359.20 and 5,777.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,960.09 : 12,359.20 = 5,777.47 : x
2. Step 2: Convert to fraction form
   8,960.09/12,359.20 = 5,777.47/x
3. Step 3: Cross multiply
   8,960.09x = 12,359.20 × 5,777.47
4. Step 4: Simplify right side
   8,960.09x = 71,404,816.54
5. Step 5: Solve for x
   x = 71,404,816.54/8,960.09
6. Step 6: Final answer
   x = 7,969.21