Finding the Fourth Proportional to 1,131.98, 1,562.02 and 689.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.98 : 1,562.02 = 689.78 : x
2. Step 2: Convert to fraction form
   1,131.98/1,562.02 = 689.78/x
3. Step 3: Cross multiply
   1,131.98x = 1,562.02 × 689.78
4. Step 4: Simplify right side
   1,131.98x = 1,077,452.34
5. Step 5: Solve for x
   x = 1,077,452.34/1,131.98
6. Step 6: Final answer
   x = 951.83