Finding the Fourth Proportional to 8,480.78, 12,721.31 and 2,934.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,480.78 : 12,721.31 = 2,934.27 : x
2. Step 2: Convert to fraction form
   8,480.78/12,721.31 = 2,934.27/x
3. Step 3: Cross multiply
   8,480.78x = 12,721.31 × 2,934.27
4. Step 4: Simplify right side
   8,480.78x = 37,327,758.29
5. Step 5: Solve for x
   x = 37,327,758.29/8,480.78
6. Step 6: Final answer
   x = 4,401.45