Finding the Fourth Proportional to 2,172.71, 3,259.67 and 712.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.71 : 3,259.67 = 712.89 : x
2. Step 2: Convert to fraction form
   2,172.71/3,259.67 = 712.89/x
3. Step 3: Cross multiply
   2,172.71x = 3,259.67 × 712.89
4. Step 4: Simplify right side
   2,172.71x = 2,323,786.15
5. Step 5: Solve for x
   x = 2,323,786.15/2,172.71
6. Step 6: Final answer
   x = 1,069.53