Finding the Fourth Proportional to 2,669.10, 4,003.80 and 820.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.10 : 4,003.80 = 820.29 : x
2. Step 2: Convert to fraction form
   2,669.10/4,003.80 = 820.29/x
3. Step 3: Cross multiply
   2,669.10x = 4,003.80 × 820.29
4. Step 4: Simplify right side
   2,669.10x = 3,284,277.10
5. Step 5: Solve for x
   x = 3,284,277.10/2,669.10
6. Step 6: Final answer
   x = 1,230.48