Finding the Fourth Proportional to 2,018.39, 2,786.60 and 1,355.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.39 : 2,786.60 = 1,355.81 : x
2. Step 2: Convert to fraction form
   2,018.39/2,786.60 = 1,355.81/x
3. Step 3: Cross multiply
   2,018.39x = 2,786.60 × 1,355.81
4. Step 4: Simplify right side
   2,018.39x = 3,778,089.60
5. Step 5: Solve for x
   x = 3,778,089.60/2,018.39
6. Step 6: Final answer
   x = 1,871.84