Finding the Fourth Proportional to 355,443.72, 490,433.28 and 204,540.72

Step by Step Solution

1. Step 1: Write the proportion equation
   355,443.72 : 490,433.28 = 204,540.72 : x
2. Step 2: Convert to fraction form
   355,443.72/490,433.28 = 204,540.72/x
3. Step 3: Cross multiply
   355,443.72x = 490,433.28 × 204,540.72
4. Step 4: Simplify right side
   355,443.72x = 100,313,576,203.16
5. Step 5: Solve for x
   x = 100,313,576,203.16/355,443.72
6. Step 6: Final answer
   x = 282,220.70