Finding the Fourth Proportional to 2,823.77, 4,227.83 and 2,128.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,823.77 : 4,227.83 = 2,128.34 : x
2. Step 2: Convert to fraction form
   2,823.77/4,227.83 = 2,128.34/x
3. Step 3: Cross multiply
   2,823.77x = 4,227.83 × 2,128.34
4. Step 4: Simplify right side
   2,823.77x = 8,998,227.92
5. Step 5: Solve for x
   x = 8,998,227.92/2,823.77
6. Step 6: Final answer
   x = 3,186.61