Finding the Fourth Proportional to 10,571, 15,851.76 and 5,639.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,571 : 15,851.76 = 5,639.48 : x
2. Step 2: Convert to fraction form
   10,571/15,851.76 = 5,639.48/x
3. Step 3: Cross multiply
   10,571x = 15,851.76 × 5,639.48
4. Step 4: Simplify right side
   10,571x = 89,395,683.48
5. Step 5: Solve for x
   x = 89,395,683.48/10,571
6. Step 6: Final answer
   x = 8,456.69