Finding the Fourth Proportional to 1,391.33, 2,087.25 and 698.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.33 : 2,087.25 = 698.03 : x
2. Step 2: Convert to fraction form
   1,391.33/2,087.25 = 698.03/x
3. Step 3: Cross multiply
   1,391.33x = 2,087.25 × 698.03
4. Step 4: Simplify right side
   1,391.33x = 1,456,963.12
5. Step 5: Solve for x
   x = 1,456,963.12/1,391.33
6. Step 6: Final answer
   x = 1,047.17