Finding the Fourth Proportional to 1,448.28, 2,171.34 and 871.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,448.28 : 2,171.34 = 871.02 : x
2. Step 2: Convert to fraction form
   1,448.28/2,171.34 = 871.02/x
3. Step 3: Cross multiply
   1,448.28x = 2,171.34 × 871.02
4. Step 4: Simplify right side
   1,448.28x = 1,891,280.57
5. Step 5: Solve for x
   x = 1,891,280.57/1,448.28
6. Step 6: Final answer
   x = 1,305.88