Finding the Fourth Proportional to 1,443.42, 1,991.97 and 912.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.42 : 1,991.97 = 912.11 : x
2. Step 2: Convert to fraction form
   1,443.42/1,991.97 = 912.11/x
3. Step 3: Cross multiply
   1,443.42x = 1,991.97 × 912.11
4. Step 4: Simplify right side
   1,443.42x = 1,816,891.03
5. Step 5: Solve for x
   x = 1,816,891.03/1,443.42
6. Step 6: Final answer
   x = 1,258.74