Finding the Fourth Proportional to 12,960.78, 19,441.21 and 3,601.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,960.78 : 19,441.21 = 3,601.31 : x
2. Step 2: Convert to fraction form
   12,960.78/19,441.21 = 3,601.31/x
3. Step 3: Cross multiply
   12,960.78x = 19,441.21 × 3,601.31
4. Step 4: Simplify right side
   12,960.78x = 70,013,823.99
5. Step 5: Solve for x
   x = 70,013,823.99/12,960.78
6. Step 6: Final answer
   x = 5,401.98