Finding the Fourth Proportional to 1,329.15, 1,994.15 and 404.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.15 : 1,994.15 = 404.89 : x
2. Step 2: Convert to fraction form
   1,329.15/1,994.15 = 404.89/x
3. Step 3: Cross multiply
   1,329.15x = 1,994.15 × 404.89
4. Step 4: Simplify right side
   1,329.15x = 807,401.42
5. Step 5: Solve for x
   x = 807,401.42/1,329.15
6. Step 6: Final answer
   x = 607.46