Finding the Fourth Proportional to 1,559.53, 2,152.09 and 860.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.53 : 2,152.09 = 860.89 : x
2. Step 2: Convert to fraction form
   1,559.53/2,152.09 = 860.89/x
3. Step 3: Cross multiply
   1,559.53x = 2,152.09 × 860.89
4. Step 4: Simplify right side
   1,559.53x = 1,852,712.76
5. Step 5: Solve for x
   x = 1,852,712.76/1,559.53
6. Step 6: Final answer
   x = 1,187.99