Finding the Fourth Proportional to 2,018.78, 3,027.76 and 558.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.78 : 3,027.76 = 558.01 : x
2. Step 2: Convert to fraction form
   2,018.78/3,027.76 = 558.01/x
3. Step 3: Cross multiply
   2,018.78x = 3,027.76 × 558.01
4. Step 4: Simplify right side
   2,018.78x = 1,689,502.43
5. Step 5: Solve for x
   x = 1,689,502.43/2,018.78
6. Step 6: Final answer
   x = 836.89