Finding the Fourth Proportional to 1,131.04, 1,560.72 and 688.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.04 : 1,560.72 = 688.96 : x
2. Step 2: Convert to fraction form
   1,131.04/1,560.72 = 688.96/x
3. Step 3: Cross multiply
   1,131.04x = 1,560.72 × 688.96
4. Step 4: Simplify right side
   1,131.04x = 1,075,273.65
5. Step 5: Solve for x
   x = 1,075,273.65/1,131.04
6. Step 6: Final answer
   x = 950.69