Finding the Fourth Proportional to 1,904.38, 2,857.46 and 672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,904.38 : 2,857.46 = 672.72 : x
2. Step 2: Convert to fraction form
   1,904.38/2,857.46 = 672.72/x
3. Step 3: Cross multiply
   1,904.38x = 2,857.46 × 672.72
4. Step 4: Simplify right side
   1,904.38x = 1,922,270.49
5. Step 5: Solve for x
   x = 1,922,270.49/1,904.38
6. Step 6: Final answer
   x = 1,009.39