Finding the Fourth Proportional to 1,402.88, 2,103.15 and 939.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.88 : 2,103.15 = 939.25 : x
2. Step 2: Convert to fraction form
   1,402.88/2,103.15 = 939.25/x
3. Step 3: Cross multiply
   1,402.88x = 2,103.15 × 939.25
4. Step 4: Simplify right side
   1,402.88x = 1,975,383.64
5. Step 5: Solve for x
   x = 1,975,383.64/1,402.88
6. Step 6: Final answer
   x = 1,408.09