Finding the Fourth Proportional to 1,559.12, 2,151.60 and 860.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.12 : 2,151.60 = 860.52 : x
2. Step 2: Convert to fraction form
   1,559.12/2,151.60 = 860.52/x
3. Step 3: Cross multiply
   1,559.12x = 2,151.60 × 860.52
4. Step 4: Simplify right side
   1,559.12x = 1,851,494.83
5. Step 5: Solve for x
   x = 1,851,494.83/1,559.12
6. Step 6: Final answer
   x = 1,187.53