Finding the Fourth Proportional to 2,830.43, 3,907.89 and 2,166.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.43 : 3,907.89 = 2,166.09 : x
2. Step 2: Convert to fraction form
   2,830.43/3,907.89 = 2,166.09/x
3. Step 3: Cross multiply
   2,830.43x = 3,907.89 × 2,166.09
4. Step 4: Simplify right side
   2,830.43x = 8,464,841.45
5. Step 5: Solve for x
   x = 8,464,841.45/2,830.43
6. Step 6: Final answer
   x = 2,990.66