Finding the Fourth Proportional to 1,438.56, 1,981.36 and 1,143.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.56 : 1,981.36 = 1,143.32 : x
2. Step 2: Convert to fraction form
   1,438.56/1,981.36 = 1,143.32/x
3. Step 3: Cross multiply
   1,438.56x = 1,981.36 × 1,143.32
4. Step 4: Simplify right side
   1,438.56x = 2,265,320.04
5. Step 5: Solve for x
   x = 2,265,320.04/1,438.56
6. Step 6: Final answer
   x = 1,574.71