Finding the Fourth Proportional to 355,158.72, 490,118.40 and 204,284.16

Step by Step Solution

1. Step 1: Write the proportion equation
   355,158.72 : 490,118.40 = 204,284.16 : x
2. Step 2: Convert to fraction form
   355,158.72/490,118.40 = 204,284.16/x
3. Step 3: Cross multiply
   355,158.72x = 490,118.40 × 204,284.16
4. Step 4: Simplify right side
   355,158.72x = 100,123,425,644.54
5. Step 5: Solve for x
   x = 100,123,425,644.54/355,158.72
6. Step 6: Final answer
   x = 281,911.78