Finding the Fourth Proportional to 1,574.38, 2,172.61 and 866.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,574.38 : 2,172.61 = 866.25 : x
2. Step 2: Convert to fraction form
   1,574.38/2,172.61 = 866.25/x
3. Step 3: Cross multiply
   1,574.38x = 2,172.61 × 866.25
4. Step 4: Simplify right side
   1,574.38x = 1,882,021.25
5. Step 5: Solve for x
   x = 1,882,021.25/1,574.38
6. Step 6: Final answer
   x = 1,195.41