Finding the Fourth Proportional to 1,574.61, 2,172.89 and 866.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,574.61 : 2,172.89 = 866.49 : x
2. Step 2: Convert to fraction form
   1,574.61/2,172.89 = 866.49/x
3. Step 3: Cross multiply
   1,574.61x = 2,172.89 × 866.49
4. Step 4: Simplify right side
   1,574.61x = 1,882,787.46
5. Step 5: Solve for x
   x = 1,882,787.46/1,574.61
6. Step 6: Final answer
   x = 1,195.72