Finding the Fourth Proportional to 1,290.12, 1,934.37 and 559.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.12 : 1,934.37 = 559.32 : x
2. Step 2: Convert to fraction form
   1,290.12/1,934.37 = 559.32/x
3. Step 3: Cross multiply
   1,290.12x = 1,934.37 × 559.32
4. Step 4: Simplify right side
   1,290.12x = 1,081,931.83
5. Step 5: Solve for x
   x = 1,081,931.83/1,290.12
6. Step 6: Final answer
   x = 838.63