Finding the Fourth Proportional to 1,225.98, 1,839.12 and 404.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.98 : 1,839.12 = 404.34 : x
2. Step 2: Convert to fraction form
   1,225.98/1,839.12 = 404.34/x
3. Step 3: Cross multiply
   1,225.98x = 1,839.12 × 404.34
4. Step 4: Simplify right side
   1,225.98x = 743,629.78
5. Step 5: Solve for x
   x = 743,629.78/1,225.98
6. Step 6: Final answer
   x = 606.56