Finding the Fourth Proportional to 8,321.76, 12,479.58 and 3,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.76 : 12,479.58 = 3,388.72 : x
2. Step 2: Convert to fraction form
   8,321.76/12,479.58 = 3,388.72/x
3. Step 3: Cross multiply
   8,321.76x = 12,479.58 × 3,388.72
4. Step 4: Simplify right side
   8,321.76x = 42,289,802.34
5. Step 5: Solve for x
   x = 42,289,802.34/8,321.76
6. Step 6: Final answer
   x = 5,081.83