Finding the Fourth Proportional to 1,443.12, 1,991.68 and 946.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.12 : 1,991.68 = 946.20 : x
2. Step 2: Convert to fraction form
   1,443.12/1,991.68 = 946.20/x
3. Step 3: Cross multiply
   1,443.12x = 1,991.68 × 946.20
4. Step 4: Simplify right side
   1,443.12x = 1,884,527.62
5. Step 5: Solve for x
   x = 1,884,527.62/1,443.12
6. Step 6: Final answer
   x = 1,305.87