Finding the Fourth Proportional to 2,187.78, 3,022.56 and 1,859.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.78 : 3,022.56 = 1,859.64 : x
2. Step 2: Convert to fraction form
   2,187.78/3,022.56 = 1,859.64/x
3. Step 3: Cross multiply
   2,187.78x = 3,022.56 × 1,859.64
4. Step 4: Simplify right side
   2,187.78x = 5,620,873.48
5. Step 5: Solve for x
   x = 5,620,873.48/2,187.78
6. Step 6: Final answer
   x = 2,569.21