Finding the Fourth Proportional to 1,290.08, 1,934.78 and 559.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.08 : 1,934.78 = 559.49 : x
2. Step 2: Convert to fraction form
   1,290.08/1,934.78 = 559.49/x
3. Step 3: Cross multiply
   1,290.08x = 1,934.78 × 559.49
4. Step 4: Simplify right side
   1,290.08x = 1,082,477.59
5. Step 5: Solve for x
   x = 1,082,477.59/1,290.08
6. Step 6: Final answer
   x = 839.08