Finding the Fourth Proportional to 2,172.65, 3,259.47 and 711.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.65 : 3,259.47 = 711.81 : x
2. Step 2: Convert to fraction form
   2,172.65/3,259.47 = 711.81/x
3. Step 3: Cross multiply
   2,172.65x = 3,259.47 × 711.81
4. Step 4: Simplify right side
   2,172.65x = 2,320,123.34
5. Step 5: Solve for x
   x = 2,320,123.34/2,172.65
6. Step 6: Final answer
   x = 1,067.88