Finding the Fourth Proportional to 1,559.82, 2,152.58 and 861.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.82 : 2,152.58 = 861.18 : x
2. Step 2: Convert to fraction form
   1,559.82/2,152.58 = 861.18/x
3. Step 3: Cross multiply
   1,559.82x = 2,152.58 × 861.18
4. Step 4: Simplify right side
   1,559.82x = 1,853,758.84
5. Step 5: Solve for x
   x = 1,853,758.84/1,559.82
6. Step 6: Final answer
   x = 1,188.44