Finding the Fourth Proportional to 1,289.89, 1,935.69 and 559.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289.89 : 1,935.69 = 559.54 : x
2. Step 2: Convert to fraction form
   1,289.89/1,935.69 = 559.54/x
3. Step 3: Cross multiply
   1,289.89x = 1,935.69 × 559.54
4. Step 4: Simplify right side
   1,289.89x = 1,083,095.98
5. Step 5: Solve for x
   x = 1,083,095.98/1,289.89
6. Step 6: Final answer
   x = 839.68