Finding the Fourth Proportional to 2,669.20, 4,003.72 and 820.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.20 : 4,003.72 = 820.24 : x
2. Step 2: Convert to fraction form
   2,669.20/4,003.72 = 820.24/x
3. Step 3: Cross multiply
   2,669.20x = 4,003.72 × 820.24
4. Step 4: Simplify right side
   2,669.20x = 3,284,011.29
5. Step 5: Solve for x
   x = 3,284,011.29/2,669.20
6. Step 6: Final answer
   x = 1,230.34