Finding the Fourth Proportional to 10,979.46, 16,485.59 and 10,815.44

Step by Step Solution

1. Step 1: Write the proportion equation
   10,979.46 : 16,485.59 = 10,815.44 : x
2. Step 2: Convert to fraction form
   10,979.46/16,485.59 = 10,815.44/x
3. Step 3: Cross multiply
   10,979.46x = 16,485.59 × 10,815.44
4. Step 4: Simplify right side
   10,979.46x = 178,298,854.12
5. Step 5: Solve for x
   x = 178,298,854.12/10,979.46
6. Step 6: Final answer
   x = 16,239.31