Finding the Fourth Proportional to 1,573.71, 2,171.72 and 865.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.71 : 2,171.72 = 865.57 : x
2. Step 2: Convert to fraction form
   1,573.71/2,171.72 = 865.57/x
3. Step 3: Cross multiply
   1,573.71x = 2,171.72 × 865.57
4. Step 4: Simplify right side
   1,573.71x = 1,879,776.49
5. Step 5: Solve for x
   x = 1,879,776.49/1,573.71
6. Step 6: Final answer
   x = 1,194.48