Finding the Fourth Proportional to 1,412.28, 1,949.01 and 939.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,412.28 : 1,949.01 = 939.30 : x
2. Step 2: Convert to fraction form
   1,412.28/1,949.01 = 939.30/x
3. Step 3: Cross multiply
   1,412.28x = 1,949.01 × 939.30
4. Step 4: Simplify right side
   1,412.28x = 1,830,705.09
5. Step 5: Solve for x
   x = 1,830,705.09/1,412.28
6. Step 6: Final answer
   x = 1,296.28