Finding the Fourth Proportional to 2,822.56, 4,233.60 and 874.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,822.56 : 4,233.60 = 874.78 : x
2. Step 2: Convert to fraction form
   2,822.56/4,233.60 = 874.78/x
3. Step 3: Cross multiply
   2,822.56x = 4,233.60 × 874.78
4. Step 4: Simplify right side
   2,822.56x = 3,703,458.02
5. Step 5: Solve for x
   x = 3,703,458.02/2,822.56
6. Step 6: Final answer
   x = 1,312.09