Finding the Fourth Proportional to 1,443.42, 1,992.05 and 853.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.42 : 1,992.05 = 853.85 : x
2. Step 2: Convert to fraction form
   1,443.42/1,992.05 = 853.85/x
3. Step 3: Cross multiply
   1,443.42x = 1,992.05 × 853.85
4. Step 4: Simplify right side
   1,443.42x = 1,700,911.89
5. Step 5: Solve for x
   x = 1,700,911.89/1,443.42
6. Step 6: Final answer
   x = 1,178.39