Finding the Fourth Proportional to 12,960.48, 19,439.76 and 5,171.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,960.48 : 19,439.76 = 5,171.04 : x
2. Step 2: Convert to fraction form
   12,960.48/19,439.76 = 5,171.04/x
3. Step 3: Cross multiply
   12,960.48x = 19,439.76 × 5,171.04
4. Step 4: Simplify right side
   12,960.48x = 100,523,776.55
5. Step 5: Solve for x
   x = 100,523,776.55/12,960.48
6. Step 6: Final answer
   x = 7,756.18