Finding the Fourth Proportional to 13,323.20, 19,981.38 and 3,960.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,323.20 : 19,981.38 = 3,960.79 : x
2. Step 2: Convert to fraction form
   13,323.20/19,981.38 = 3,960.79/x
3. Step 3: Cross multiply
   13,323.20x = 19,981.38 × 3,960.79
4. Step 4: Simplify right side
   13,323.20x = 79,142,050.09
5. Step 5: Solve for x
   x = 79,142,050.09/13,323.20
6. Step 6: Final answer
   x = 5,940.17