Finding the Fourth Proportional to 1,387.31, 2,083.73 and 868.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.31 : 2,083.73 = 868.23 : x
2. Step 2: Convert to fraction form
   1,387.31/2,083.73 = 868.23/x
3. Step 3: Cross multiply
   1,387.31x = 2,083.73 × 868.23
4. Step 4: Simplify right side
   1,387.31x = 1,809,152.56
5. Step 5: Solve for x
   x = 1,809,152.56/1,387.31
6. Step 6: Final answer
   x = 1,304.08