Finding the Fourth Proportional to 2,018.86, 2,786.47 and 1,355.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.86 : 2,786.47 = 1,355.20 : x
2. Step 2: Convert to fraction form
   2,018.86/2,786.47 = 1,355.20/x
3. Step 3: Cross multiply
   2,018.86x = 2,786.47 × 1,355.20
4. Step 4: Simplify right side
   2,018.86x = 3,776,213.79
5. Step 5: Solve for x
   x = 3,776,213.79/2,018.86
6. Step 6: Final answer
   x = 1,870.47