Finding the Fourth Proportional to 1,131.07, 1,560.96 and 688.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.07 : 1,560.96 = 688.87 : x
2. Step 2: Convert to fraction form
   1,131.07/1,560.96 = 688.87/x
3. Step 3: Cross multiply
   1,131.07x = 1,560.96 × 688.87
4. Step 4: Simplify right side
   1,131.07x = 1,075,298.52
5. Step 5: Solve for x
   x = 1,075,298.52/1,131.07
6. Step 6: Final answer
   x = 950.69