Finding the Fourth Proportional to 1,559.69, 2,152.47 and 861.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.69 : 2,152.47 = 861.06 : x
2. Step 2: Convert to fraction form
   1,559.69/2,152.47 = 861.06/x
3. Step 3: Cross multiply
   1,559.69x = 2,152.47 × 861.06
4. Step 4: Simplify right side
   1,559.69x = 1,853,405.82
5. Step 5: Solve for x
   x = 1,853,405.82/1,559.69
6. Step 6: Final answer
   x = 1,188.32