Finding the Fourth Proportional to 2,280.86, 3,421.52 and 820.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.86 : 3,421.52 = 820.58 : x
2. Step 2: Convert to fraction form
   2,280.86/3,421.52 = 820.58/x
3. Step 3: Cross multiply
   2,280.86x = 3,421.52 × 820.58
4. Step 4: Simplify right side
   2,280.86x = 2,807,630.88
5. Step 5: Solve for x
   x = 2,807,630.88/2,280.86
6. Step 6: Final answer
   x = 1,230.95