Finding the Fourth Proportional to 2,809.05, 4,214.12 and 861.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.05 : 4,214.12 = 861.27 : x
2. Step 2: Convert to fraction form
   2,809.05/4,214.12 = 861.27/x
3. Step 3: Cross multiply
   2,809.05x = 4,214.12 × 861.27
4. Step 4: Simplify right side
   2,809.05x = 3,629,490.83
5. Step 5: Solve for x
   x = 3,629,490.83/2,809.05
6. Step 6: Final answer
   x = 1,292.07