Finding the Fourth Proportional to 1,155.18, 1,594.17 and 689.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.18 : 1,594.17 = 689.70 : x
2. Step 2: Convert to fraction form
   1,155.18/1,594.17 = 689.70/x
3. Step 3: Cross multiply
   1,155.18x = 1,594.17 × 689.70
4. Step 4: Simplify right side
   1,155.18x = 1,099,499.05
5. Step 5: Solve for x
   x = 1,099,499.05/1,155.18
6. Step 6: Final answer
   x = 951.80