Finding the Fourth Proportional to 2,172.67, 3,259.49 and 671.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.67 : 3,259.49 = 671.71 : x
2. Step 2: Convert to fraction form
   2,172.67/3,259.49 = 671.71/x
3. Step 3: Cross multiply
   2,172.67x = 3,259.49 × 671.71
4. Step 4: Simplify right side
   2,172.67x = 2,189,412.37
5. Step 5: Solve for x
   x = 2,189,412.37/2,172.67
6. Step 6: Final answer
   x = 1,007.71