Finding the Fourth Proportional to 1,443.04, 1,991.51 and 853.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.04 : 1,991.51 = 853.69 : x
2. Step 2: Convert to fraction form
   1,443.04/1,991.51 = 853.69/x
3. Step 3: Cross multiply
   1,443.04x = 1,991.51 × 853.69
4. Step 4: Simplify right side
   1,443.04x = 1,700,132.17
5. Step 5: Solve for x
   x = 1,700,132.17/1,443.04
6. Step 6: Final answer
   x = 1,178.16