Finding the Fourth Proportional to 10,998.57, 16,499.49 and 3,979.11

Step by Step Solution

1. Step 1: Write the proportion equation
   10,998.57 : 16,499.49 = 3,979.11 : x
2. Step 2: Convert to fraction form
   10,998.57/16,499.49 = 3,979.11/x
3. Step 3: Cross multiply
   10,998.57x = 16,499.49 × 3,979.11
4. Step 4: Simplify right side
   10,998.57x = 65,653,285.65
5. Step 5: Solve for x
   x = 65,653,285.65/10,998.57
6. Step 6: Final answer
   x = 5,969.26