Finding the Fourth Proportional to 10,979.69, 16,469.40 and 4,405.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,979.69 : 16,469.40 = 4,405.76 : x
2. Step 2: Convert to fraction form
   10,979.69/16,469.40 = 4,405.76/x
3. Step 3: Cross multiply
   10,979.69x = 16,469.40 × 4,405.76
4. Step 4: Simplify right side
   10,979.69x = 72,560,141.40
5. Step 5: Solve for x
   x = 72,560,141.40/10,979.69
6. Step 6: Final answer
   x = 6,608.58