Finding the Fourth Proportional to 2,821.89, 4,233.78 and 974.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,821.89 : 4,233.78 = 974.28 : x
2. Step 2: Convert to fraction form
   2,821.89/4,233.78 = 974.28/x
3. Step 3: Cross multiply
   2,821.89x = 4,233.78 × 974.28
4. Step 4: Simplify right side
   2,821.89x = 4,124,887.18
5. Step 5: Solve for x
   x = 4,124,887.18/2,821.89
6. Step 6: Final answer
   x = 1,461.75