Finding the Fourth Proportional to 1,559.85, 2,149.89 and 1,139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.85 : 2,149.89 = 1,139.55 : x
2. Step 2: Convert to fraction form
   1,559.85/2,149.89 = 1,139.55/x
3. Step 3: Cross multiply
   1,559.85x = 2,149.89 × 1,139.55
4. Step 4: Simplify right side
   1,559.85x = 2,449,907.15
5. Step 5: Solve for x
   x = 2,449,907.15/1,559.85
6. Step 6: Final answer
   x = 1,570.60