Finding the Fourth Proportional to 2,172.69, 3,259.55 and 711.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.69 : 3,259.55 = 711.86 : x
2. Step 2: Convert to fraction form
   2,172.69/3,259.55 = 711.86/x
3. Step 3: Cross multiply
   2,172.69x = 3,259.55 × 711.86
4. Step 4: Simplify right side
   2,172.69x = 2,320,328.74
5. Step 5: Solve for x
   x = 2,320,328.74/2,172.69
6. Step 6: Final answer
   x = 1,067.95