Finding the Fourth Proportional to 2,281.86, 3,423.18 and 821.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,281.86 : 3,423.18 = 821.16 : x
2. Step 2: Convert to fraction form
   2,281.86/3,423.18 = 821.16/x
3. Step 3: Cross multiply
   2,281.86x = 3,423.18 × 821.16
4. Step 4: Simplify right side
   2,281.86x = 2,810,978.49
5. Step 5: Solve for x
   x = 2,810,978.49/2,281.86
6. Step 6: Final answer
   x = 1,231.88