Finding the Fourth Proportional to 2,821.69, 4,229.42 and 2,126.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,821.69 : 4,229.42 = 2,126.10 : x
2. Step 2: Convert to fraction form
   2,821.69/4,229.42 = 2,126.10/x
3. Step 3: Cross multiply
   2,821.69x = 4,229.42 × 2,126.10
4. Step 4: Simplify right side
   2,821.69x = 8,992,151.30
5. Step 5: Solve for x
   x = 8,992,151.30/2,821.69
6. Step 6: Final answer
   x = 3,186.80