Finding the Fourth Proportional to 1,443.88, 1,991.58 and 1,071.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.88 : 1,991.58 = 1,071.19 : x
2. Step 2: Convert to fraction form
   1,443.88/1,991.58 = 1,071.19/x
3. Step 3: Cross multiply
   1,443.88x = 1,991.58 × 1,071.19
4. Step 4: Simplify right side
   1,443.88x = 2,133,350.62
5. Step 5: Solve for x
   x = 2,133,350.62/1,443.88
6. Step 6: Final answer
   x = 1,477.52