Finding the Fourth Proportional to 1,290.69, 1,935.46 and 559.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.69 : 1,935.46 = 559.72 : x
2. Step 2: Convert to fraction form
   1,290.69/1,935.46 = 559.72/x
3. Step 3: Cross multiply
   1,290.69x = 1,935.46 × 559.72
4. Step 4: Simplify right side
   1,290.69x = 1,083,315.67
5. Step 5: Solve for x
   x = 1,083,315.67/1,290.69
6. Step 6: Final answer
   x = 839.33