Finding the Fourth Proportional to 2,859.31, 3,945.34 and 1,680.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.31 : 3,945.34 = 1,680.62 : x
2. Step 2: Convert to fraction form
   2,859.31/3,945.34 = 1,680.62/x
3. Step 3: Cross multiply
   2,859.31x = 3,945.34 × 1,680.62
4. Step 4: Simplify right side
   2,859.31x = 6,630,617.31
5. Step 5: Solve for x
   x = 6,630,617.31/2,859.31
6. Step 6: Final answer
   x = 2,318.96