Finding the Fourth Proportional to 1,559.32, 2,151.86 and 860.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.32 : 2,151.86 = 860.68 : x
2. Step 2: Convert to fraction form
   1,559.32/2,151.86 = 860.68/x
3. Step 3: Cross multiply
   1,559.32x = 2,151.86 × 860.68
4. Step 4: Simplify right side
   1,559.32x = 1,852,062.86
5. Step 5: Solve for x
   x = 1,852,062.86/1,559.32
6. Step 6: Final answer
   x = 1,187.74