Finding the Fourth Proportional to 1,359.31, 2,028.69 and 1,228.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.31 : 2,028.69 = 1,228.09 : x
2. Step 2: Convert to fraction form
   1,359.31/2,028.69 = 1,228.09/x
3. Step 3: Cross multiply
   1,359.31x = 2,028.69 × 1,228.09
4. Step 4: Simplify right side
   1,359.31x = 2,491,413.90
5. Step 5: Solve for x
   x = 2,491,413.90/1,359.31
6. Step 6: Final answer
   x = 1,832.85