Finding the Fourth Proportional to 1,573.59, 2,171.47 and 865.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.59 : 2,171.47 = 865.42 : x
2. Step 2: Convert to fraction form
   1,573.59/2,171.47 = 865.42/x
3. Step 3: Cross multiply
   1,573.59x = 2,171.47 × 865.42
4. Step 4: Simplify right side
   1,573.59x = 1,879,233.57
5. Step 5: Solve for x
   x = 1,879,233.57/1,573.59
6. Step 6: Final answer
   x = 1,194.23