Finding the Fourth Proportional to 1,131.04, 1,560.76 and 688.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.04 : 1,560.76 = 688.86 : x
2. Step 2: Convert to fraction form
   1,131.04/1,560.76 = 688.86/x
3. Step 3: Cross multiply
   1,131.04x = 1,560.76 × 688.86
4. Step 4: Simplify right side
   1,131.04x = 1,075,145.13
5. Step 5: Solve for x
   x = 1,075,145.13/1,131.04
6. Step 6: Final answer
   x = 950.58