Finding the Fourth Proportional to 1,939.72, 2,676.84 and 1,055.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.72 : 2,676.84 = 1,055.56 : x
2. Step 2: Convert to fraction form
   1,939.72/2,676.84 = 1,055.56/x
3. Step 3: Cross multiply
   1,939.72x = 2,676.84 × 1,055.56
4. Step 4: Simplify right side
   1,939.72x = 2,825,565.23
5. Step 5: Solve for x
   x = 2,825,565.23/1,939.72
6. Step 6: Final answer
   x = 1,456.69