Finding the Fourth Proportional to 1,671.78, 2,305.56 and 1,081.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,671.78 : 2,305.56 = 1,081.71 : x
2. Step 2: Convert to fraction form
   1,671.78/2,305.56 = 1,081.71/x
3. Step 3: Cross multiply
   1,671.78x = 2,305.56 × 1,081.71
4. Step 4: Simplify right side
   1,671.78x = 2,493,947.31
5. Step 5: Solve for x
   x = 2,493,947.31/1,671.78
6. Step 6: Final answer
   x = 1,491.79