Finding the Fourth Proportional to 12,960.18, 19,440.18 and 5,559.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,960.18 : 19,440.18 = 5,559.84 : x
2. Step 2: Convert to fraction form
   12,960.18/19,440.18 = 5,559.84/x
3. Step 3: Cross multiply
   12,960.18x = 19,440.18 × 5,559.84
4. Step 4: Simplify right side
   12,960.18x = 108,084,290.37
5. Step 5: Solve for x
   x = 108,084,290.37/12,960.18
6. Step 6: Final answer
   x = 8,339.72