Finding the Fourth Proportional to 1,671.89, 2,508.91 and 685.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,671.89 : 2,508.91 = 685.49 : x
2. Step 2: Convert to fraction form
   1,671.89/2,508.91 = 685.49/x
3. Step 3: Cross multiply
   1,671.89x = 2,508.91 × 685.49
4. Step 4: Simplify right side
   1,671.89x = 1,719,818.46
5. Step 5: Solve for x
   x = 1,719,818.46/1,671.89
6. Step 6: Final answer
   x = 1,028.67