Finding the Fourth Proportional to 1,559.13, 2,151.41 and 860.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.13 : 2,151.41 = 860.37 : x
2. Step 2: Convert to fraction form
   1,559.13/2,151.41 = 860.37/x
3. Step 3: Cross multiply
   1,559.13x = 2,151.41 × 860.37
4. Step 4: Simplify right side
   1,559.13x = 1,851,004.32
5. Step 5: Solve for x
   x = 1,851,004.32/1,559.13
6. Step 6: Final answer
   x = 1,187.20