Finding the Fourth Proportional to 1,443.30, 1,991.42 and 853.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.30 : 1,991.42 = 853.52 : x
2. Step 2: Convert to fraction form
   1,443.30/1,991.42 = 853.52/x
3. Step 3: Cross multiply
   1,443.30x = 1,991.42 × 853.52
4. Step 4: Simplify right side
   1,443.30x = 1,699,716.80
5. Step 5: Solve for x
   x = 1,699,716.80/1,443.30
6. Step 6: Final answer
   x = 1,177.66