Finding the Fourth Proportional to 2,187.78, 3,016.69 and 1,788.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.78 : 3,016.69 = 1,788.20 : x
2. Step 2: Convert to fraction form
   2,187.78/3,016.69 = 1,788.20/x
3. Step 3: Cross multiply
   2,187.78x = 3,016.69 × 1,788.20
4. Step 4: Simplify right side
   2,187.78x = 5,394,436.12
5. Step 5: Solve for x
   x = 5,394,436.12/2,187.78
6. Step 6: Final answer
   x = 2,465.71