Finding the Fourth Proportional to 2,146.69, 3,218.82 and 685.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.69 : 3,218.82 = 685.05 : x
2. Step 2: Convert to fraction form
   2,146.69/3,218.82 = 685.05/x
3. Step 3: Cross multiply
   2,146.69x = 3,218.82 × 685.05
4. Step 4: Simplify right side
   2,146.69x = 2,205,052.64
5. Step 5: Solve for x
   x = 2,205,052.64/2,146.69
6. Step 6: Final answer
   x = 1,027.19