Finding the Fourth Proportional to 2,018.72, 3,028.17 and 557.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.72 : 3,028.17 = 557.84 : x
2. Step 2: Convert to fraction form
   2,018.72/3,028.17 = 557.84/x
3. Step 3: Cross multiply
   2,018.72x = 3,028.17 × 557.84
4. Step 4: Simplify right side
   2,018.72x = 1,689,234.35
5. Step 5: Solve for x
   x = 1,689,234.35/2,018.72
6. Step 6: Final answer
   x = 836.78