Finding the Fourth Proportional to 1,441.98, 1,989.81 and 812.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.98 : 1,989.81 = 812.43 : x
2. Step 2: Convert to fraction form
   1,441.98/1,989.81 = 812.43/x
3. Step 3: Cross multiply
   1,441.98x = 1,989.81 × 812.43
4. Step 4: Simplify right side
   1,441.98x = 1,616,581.34
5. Step 5: Solve for x
   x = 1,616,581.34/1,441.98
6. Step 6: Final answer
   x = 1,121.08