Finding the Fourth Proportional to 1,443.22, 1,991.48 and 853.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.22 : 1,991.48 = 853.54 : x
2. Step 2: Convert to fraction form
   1,443.22/1,991.48 = 853.54/x
3. Step 3: Cross multiply
   1,443.22x = 1,991.48 × 853.54
4. Step 4: Simplify right side
   1,443.22x = 1,699,807.84
5. Step 5: Solve for x
   x = 1,699,807.84/1,443.22
6. Step 6: Final answer
   x = 1,177.79