Finding the Fourth Proportional to 1,326.57, 1,828.89 and 1,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,326.57 : 1,828.89 = 1,139.25 : x
2. Step 2: Convert to fraction form
   1,326.57/1,828.89 = 1,139.25/x
3. Step 3: Cross multiply
   1,326.57x = 1,828.89 × 1,139.25
4. Step 4: Simplify right side
   1,326.57x = 2,083,562.93
5. Step 5: Solve for x
   x = 2,083,562.93/1,326.57
6. Step 6: Final answer
   x = 1,570.64