Finding the Fourth Proportional to 1,171.55, 1,616.73 and 699.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.55 : 1,616.73 = 699.65 : x
2. Step 2: Convert to fraction form
   1,171.55/1,616.73 = 699.65/x
3. Step 3: Cross multiply
   1,171.55x = 1,616.73 × 699.65
4. Step 4: Simplify right side
   1,171.55x = 1,131,149.59
5. Step 5: Solve for x
   x = 1,131,149.59/1,171.55
6. Step 6: Final answer
   x = 965.52