Finding the Fourth Proportional to 1,131.25, 1,560.81 and 688.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.25 : 1,560.81 = 688.83 : x
2. Step 2: Convert to fraction form
   1,131.25/1,560.81 = 688.83/x
3. Step 3: Cross multiply
   1,131.25x = 1,560.81 × 688.83
4. Step 4: Simplify right side
   1,131.25x = 1,075,132.75
5. Step 5: Solve for x
   x = 1,075,132.75/1,131.25
6. Step 6: Final answer
   x = 950.39