Finding the Fourth Proportional to 1,440.81, 1,988.61 and 843.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.81 : 1,988.61 = 843.42 : x
2. Step 2: Convert to fraction form
   1,440.81/1,988.61 = 843.42/x
3. Step 3: Cross multiply
   1,440.81x = 1,988.61 × 843.42
4. Step 4: Simplify right side
   1,440.81x = 1,677,233.45
5. Step 5: Solve for x
   x = 1,677,233.45/1,440.81
6. Step 6: Final answer
   x = 1,164.09