Finding the Fourth Proportional to 1,647.80, 2,471.60 and 673.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.80 : 2,471.60 = 673.89 : x
2. Step 2: Convert to fraction form
   1,647.80/2,471.60 = 673.89/x
3. Step 3: Cross multiply
   1,647.80x = 2,471.60 × 673.89
4. Step 4: Simplify right side
   1,647.80x = 1,665,586.52
5. Step 5: Solve for x
   x = 1,665,586.52/1,647.80
6. Step 6: Final answer
   x = 1,010.79