Finding the Fourth Proportional to 1,559.25, 2,151.77 and 860.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.25 : 2,151.77 = 860.67 : x
2. Step 2: Convert to fraction form
   1,559.25/2,151.77 = 860.67/x
3. Step 3: Cross multiply
   1,559.25x = 2,151.77 × 860.67
4. Step 4: Simplify right side
   1,559.25x = 1,851,959.58
5. Step 5: Solve for x
   x = 1,851,959.58/1,559.25
6. Step 6: Final answer
   x = 1,187.72