Finding the Fourth Proportional to 8,478.81, 12,721.86 and 3,288.33

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.81 : 12,721.86 = 3,288.33 : x
2. Step 2: Convert to fraction form
   8,478.81/12,721.86 = 3,288.33/x
3. Step 3: Cross multiply
   8,478.81x = 12,721.86 × 3,288.33
4. Step 4: Simplify right side
   8,478.81x = 41,833,673.89
5. Step 5: Solve for x
   x = 41,833,673.89/8,478.81
6. Step 6: Final answer
   x = 4,933.91