Finding the Fourth Proportional to 8,570.79, 12,845.61 and 3,889.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,570.79 : 12,845.61 = 3,889.47 : x
2. Step 2: Convert to fraction form
   8,570.79/12,845.61 = 3,889.47/x
3. Step 3: Cross multiply
   8,570.79x = 12,845.61 × 3,889.47
4. Step 4: Simplify right side
   8,570.79x = 49,962,614.73
5. Step 5: Solve for x
   x = 49,962,614.73/8,570.79
6. Step 6: Final answer
   x = 5,829.41