Finding the Fourth Proportional to 2,018.90, 3,028.56 and 558.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.90 : 3,028.56 = 558.02 : x
2. Step 2: Convert to fraction form
   2,018.90/3,028.56 = 558.02/x
3. Step 3: Cross multiply
   2,018.90x = 3,028.56 × 558.02
4. Step 4: Simplify right side
   2,018.90x = 1,689,997.05
5. Step 5: Solve for x
   x = 1,689,997.05/2,018.90
6. Step 6: Final answer
   x = 837.09