Finding the Fourth Proportional to 8,470.72, 12,709.32 and 3,280.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,470.72 : 12,709.32 = 3,280.24 : x
2. Step 2: Convert to fraction form
   8,470.72/12,709.32 = 3,280.24/x
3. Step 3: Cross multiply
   8,470.72x = 12,709.32 × 3,280.24
4. Step 4: Simplify right side
   8,470.72x = 41,689,619.84
5. Step 5: Solve for x
   x = 41,689,619.84/8,470.72
6. Step 6: Final answer
   x = 4,921.61