Finding the Fourth Proportional to 2,109.40, 3,164.30 and 939.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.40 : 3,164.30 = 939.26 : x
2. Step 2: Convert to fraction form
   2,109.40/3,164.30 = 939.26/x
3. Step 3: Cross multiply
   2,109.40x = 3,164.30 × 939.26
4. Step 4: Simplify right side
   2,109.40x = 2,972,100.42
5. Step 5: Solve for x
   x = 2,972,100.42/2,109.40
6. Step 6: Final answer
   x = 1,408.98