Finding the Fourth Proportional to 1,906.72, 2,860.31 and 673.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.72 : 2,860.31 = 673.89 : x
2. Step 2: Convert to fraction form
   1,906.72/2,860.31 = 673.89/x
3. Step 3: Cross multiply
   1,906.72x = 2,860.31 × 673.89
4. Step 4: Simplify right side
   1,906.72x = 1,927,525.26
5. Step 5: Solve for x
   x = 1,927,525.26/1,906.72
6. Step 6: Final answer
   x = 1,010.91