Finding the Fourth Proportional to 2,669.30, 4,004.52 and 820.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.30 : 4,004.52 = 820.56 : x
2. Step 2: Convert to fraction form
   2,669.30/4,004.52 = 820.56/x
3. Step 3: Cross multiply
   2,669.30x = 4,004.52 × 820.56
4. Step 4: Simplify right side
   2,669.30x = 3,285,948.93
5. Step 5: Solve for x
   x = 3,285,948.93/2,669.30
6. Step 6: Final answer
   x = 1,231.02