Finding the Fourth Proportional to 1,559.92, 2,152.72 and 861.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.92 : 2,152.72 = 861.32 : x
2. Step 2: Convert to fraction form
   1,559.92/2,152.72 = 861.32/x
3. Step 3: Cross multiply
   1,559.92x = 2,152.72 × 861.32
4. Step 4: Simplify right side
   1,559.92x = 1,854,180.79
5. Step 5: Solve for x
   x = 1,854,180.79/1,559.92
6. Step 6: Final answer
   x = 1,188.64