Finding the Fourth Proportional to 8,321.05, 12,481.34 and 3,389.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.05 : 12,481.34 = 3,389.47 : x
2. Step 2: Convert to fraction form
   8,321.05/12,481.34 = 3,389.47/x
3. Step 3: Cross multiply
   8,321.05x = 12,481.34 × 3,389.47
4. Step 4: Simplify right side
   8,321.05x = 42,305,110.54
5. Step 5: Solve for x
   x = 42,305,110.54/8,321.05
6. Step 6: Final answer
   x = 5,084.11