Finding the Fourth Proportional to 1,388.39, 2,083.25 and 868.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.39 : 2,083.25 = 868.25 : x
2. Step 2: Convert to fraction form
   1,388.39/2,083.25 = 868.25/x
3. Step 3: Cross multiply
   1,388.39x = 2,083.25 × 868.25
4. Step 4: Simplify right side
   1,388.39x = 1,808,781.81
5. Step 5: Solve for x
   x = 1,808,781.81/1,388.39
6. Step 6: Final answer
   x = 1,302.79