Finding the Fourth Proportional to 2,018.76, 3,021.90 and 1,128.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.76 : 3,021.90 = 1,128.03 : x
2. Step 2: Convert to fraction form
   2,018.76/3,021.90 = 1,128.03/x
3. Step 3: Cross multiply
   2,018.76x = 3,021.90 × 1,128.03
4. Step 4: Simplify right side
   2,018.76x = 3,408,793.86
5. Step 5: Solve for x
   x = 3,408,793.86/2,018.76
6. Step 6: Final answer
   x = 1,688.56