Finding the Fourth Proportional to 1,131.79, 1,562.35 and 689.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.79 : 1,562.35 = 689.85 : x
2. Step 2: Convert to fraction form
   1,131.79/1,562.35 = 689.85/x
3. Step 3: Cross multiply
   1,131.79x = 1,562.35 × 689.85
4. Step 4: Simplify right side
   1,131.79x = 1,077,787.15
5. Step 5: Solve for x
   x = 1,077,787.15/1,131.79
6. Step 6: Final answer
   x = 952.29