Finding the Fourth Proportional to 1,868.15, 2,578.06 and 1,028.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.15 : 2,578.06 = 1,028.89 : x
2. Step 2: Convert to fraction form
   1,868.15/2,578.06 = 1,028.89/x
3. Step 3: Cross multiply
   1,868.15x = 2,578.06 × 1,028.89
4. Step 4: Simplify right side
   1,868.15x = 2,652,540.15
5. Step 5: Solve for x
   x = 2,652,540.15/1,868.15
6. Step 6: Final answer
   x = 1,419.88