Finding the Fourth Proportional to 2,018.22, 2,785.83 and 1,388.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.22 : 2,785.83 = 1,388.22 : x
2. Step 2: Convert to fraction form
   2,018.22/2,785.83 = 1,388.22/x
3. Step 3: Cross multiply
   2,018.22x = 2,785.83 × 1,388.22
4. Step 4: Simplify right side
   2,018.22x = 3,867,344.92
5. Step 5: Solve for x
   x = 3,867,344.92/2,018.22
6. Step 6: Final answer
   x = 1,916.22