Finding the Fourth Proportional to 2,671.31, 4,007.91 and 1,939.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,671.31 : 4,007.91 = 1,939.61 : x
2. Step 2: Convert to fraction form
   2,671.31/4,007.91 = 1,939.61/x
3. Step 3: Cross multiply
   2,671.31x = 4,007.91 × 1,939.61
4. Step 4: Simplify right side
   2,671.31x = 7,773,799.61
5. Step 5: Solve for x
   x = 7,773,799.61/2,671.31
6. Step 6: Final answer
   x = 2,910.10