Finding the Fourth Proportional to 2,018.07, 2,783.88 and 1,355.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.07 : 2,783.88 = 1,355.15 : x
2. Step 2: Convert to fraction form
   2,018.07/2,783.88 = 1,355.15/x
3. Step 3: Cross multiply
   2,018.07x = 2,783.88 × 1,355.15
4. Step 4: Simplify right side
   2,018.07x = 3,772,561.06
5. Step 5: Solve for x
   x = 3,772,561.06/2,018.07
6. Step 6: Final answer
   x = 1,869.39