Finding the Fourth Proportional to 2,172.69, 3,257.82 and 711.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.69 : 3,257.82 = 711.05 : x
2. Step 2: Convert to fraction form
   2,172.69/3,257.82 = 711.05/x
3. Step 3: Cross multiply
   2,172.69x = 3,257.82 × 711.05
4. Step 4: Simplify right side
   2,172.69x = 2,316,456.62
5. Step 5: Solve for x
   x = 2,316,456.62/2,172.69
6. Step 6: Final answer
   x = 1,066.17