Finding the Fourth Proportional to 2,019.18, 3,028.76 and 558.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,019.18 : 3,028.76 = 558.21 : x
2. Step 2: Convert to fraction form
   2,019.18/3,028.76 = 558.21/x
3. Step 3: Cross multiply
   2,019.18x = 3,028.76 × 558.21
4. Step 4: Simplify right side
   2,019.18x = 1,690,670.37
5. Step 5: Solve for x
   x = 1,690,670.37/2,019.18
6. Step 6: Final answer
   x = 837.31