Finding the Fourth Proportional to 3,078.07, 4,247.72 and 1,680.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,078.07 : 4,247.72 = 1,680.82 : x
2. Step 2: Convert to fraction form
   3,078.07/4,247.72 = 1,680.82/x
3. Step 3: Cross multiply
   3,078.07x = 4,247.72 × 1,680.82
4. Step 4: Simplify right side
   3,078.07x = 7,139,644.33
5. Step 5: Solve for x
   x = 7,139,644.33/3,078.07
6. Step 6: Final answer
   x = 2,319.52