Finding the Fourth Proportional to 1,676.69, 2,516.25 and 855.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,676.69 : 2,516.25 = 855.65 : x
2. Step 2: Convert to fraction form
   1,676.69/2,516.25 = 855.65/x
3. Step 3: Cross multiply
   1,676.69x = 2,516.25 × 855.65
4. Step 4: Simplify right side
   1,676.69x = 2,153,016.73
5. Step 5: Solve for x
   x = 2,153,016.73/1,676.69
6. Step 6: Final answer
   x = 1,284.09