Finding the Fourth Proportional to 1,443.67, 1,991.52 and 853.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.67 : 1,991.52 = 853.18 : x
2. Step 2: Convert to fraction form
   1,443.67/1,991.52 = 853.18/x
3. Step 3: Cross multiply
   1,443.67x = 1,991.52 × 853.18
4. Step 4: Simplify right side
   1,443.67x = 1,699,125.03
5. Step 5: Solve for x
   x = 1,699,125.03/1,443.67
6. Step 6: Final answer
   x = 1,176.95