Finding the Fourth Proportional to 2,665.72, 3,680.58 and 1,671.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.72 : 3,680.58 = 1,671.40 : x
2. Step 2: Convert to fraction form
   2,665.72/3,680.58 = 1,671.40/x
3. Step 3: Cross multiply
   2,665.72x = 3,680.58 × 1,671.40
4. Step 4: Simplify right side
   2,665.72x = 6,151,721.41
5. Step 5: Solve for x
   x = 6,151,721.41/2,665.72
6. Step 6: Final answer
   x = 2,307.71