Finding the Fourth Proportional to 2,669.69, 4,004.43 and 820.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.69 : 4,004.43 = 820.71 : x
2. Step 2: Convert to fraction form
   2,669.69/4,004.43 = 820.71/x
3. Step 3: Cross multiply
   2,669.69x = 4,004.43 × 820.71
4. Step 4: Simplify right side
   2,669.69x = 3,286,475.75
5. Step 5: Solve for x
   x = 3,286,475.75/2,669.69
6. Step 6: Final answer
   x = 1,231.03