Finding the Fourth Proportional to 1,084.25, 1,626.23 and 390.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.25 : 1,626.23 = 390.83 : x
2. Step 2: Convert to fraction form
   1,084.25/1,626.23 = 390.83/x
3. Step 3: Cross multiply
   1,084.25x = 1,626.23 × 390.83
4. Step 4: Simplify right side
   1,084.25x = 635,572.32
5. Step 5: Solve for x
   x = 635,572.32/1,084.25
6. Step 6: Final answer
   x = 586.18