Finding the Fourth Proportional to 1,131.97, 1,560.31 and 689.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.97 : 1,560.31 = 689.04 : x
2. Step 2: Convert to fraction form
   1,131.97/1,560.31 = 689.04/x
3. Step 3: Cross multiply
   1,131.97x = 1,560.31 × 689.04
4. Step 4: Simplify right side
   1,131.97x = 1,075,116.00
5. Step 5: Solve for x
   x = 1,075,116.00/1,131.97
6. Step 6: Final answer
   x = 949.77