Finding the Fourth Proportional to 2,149.78, 3,224.82 and 689.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.78 : 3,224.82 = 689.05 : x
2. Step 2: Convert to fraction form
   2,149.78/3,224.82 = 689.05/x
3. Step 3: Cross multiply
   2,149.78x = 3,224.82 × 689.05
4. Step 4: Simplify right side
   2,149.78x = 2,222,062.22
5. Step 5: Solve for x
   x = 2,222,062.22/2,149.78
6. Step 6: Final answer
   x = 1,033.62