Finding the Fourth Proportional to 2,007.40, 3,007.34 and 1,680.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.40 : 3,007.34 = 1,680.43 : x
2. Step 2: Convert to fraction form
   2,007.40/3,007.34 = 1,680.43/x
3. Step 3: Cross multiply
   2,007.40x = 3,007.34 × 1,680.43
4. Step 4: Simplify right side
   2,007.40x = 5,053,624.36
5. Step 5: Solve for x
   x = 5,053,624.36/2,007.40
6. Step 6: Final answer
   x = 2,517.50