Finding the Fourth Proportional to 1,559.94, 2,152.71 and 861.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.94 : 2,152.71 = 861.27 : x
2. Step 2: Convert to fraction form
   1,559.94/2,152.71 = 861.27/x
3. Step 3: Cross multiply
   1,559.94x = 2,152.71 × 861.27
4. Step 4: Simplify right side
   1,559.94x = 1,854,064.54
5. Step 5: Solve for x
   x = 1,854,064.54/1,559.94
6. Step 6: Final answer
   x = 1,188.55