Finding the Fourth Proportional to 1,939.25, 2,907.71 and 1,315.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.25 : 2,907.71 = 1,315.31 : x
2. Step 2: Convert to fraction form
   1,939.25/2,907.71 = 1,315.31/x
3. Step 3: Cross multiply
   1,939.25x = 2,907.71 × 1,315.31
4. Step 4: Simplify right side
   1,939.25x = 3,824,540.04
5. Step 5: Solve for x
   x = 3,824,540.04/1,939.25
6. Step 6: Final answer
   x = 1,972.18