Finding the Fourth Proportional to 1,155.52, 1,594.56 and 689.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.52 : 1,594.56 = 689.60 : x
2. Step 2: Convert to fraction form
   1,155.52/1,594.56 = 689.60/x
3. Step 3: Cross multiply
   1,155.52x = 1,594.56 × 689.60
4. Step 4: Simplify right side
   1,155.52x = 1,099,608.58
5. Step 5: Solve for x
   x = 1,099,608.58/1,155.52
6. Step 6: Final answer
   x = 951.61