Finding the Fourth Proportional to 2,382.84, 3,571.56 and 821.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,382.84 : 3,571.56 = 821.43 : x
2. Step 2: Convert to fraction form
   2,382.84/3,571.56 = 821.43/x
3. Step 3: Cross multiply
   2,382.84x = 3,571.56 × 821.43
4. Step 4: Simplify right side
   2,382.84x = 2,933,786.53
5. Step 5: Solve for x
   x = 2,933,786.53/2,382.84
6. Step 6: Final answer
   x = 1,231.21