Finding the Fourth Proportional to 2,007.09, 3,010.79 and 620.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.09 : 3,010.79 = 620.42 : x
2. Step 2: Convert to fraction form
   2,007.09/3,010.79 = 620.42/x
3. Step 3: Cross multiply
   2,007.09x = 3,010.79 × 620.42
4. Step 4: Simplify right side
   2,007.09x = 1,867,954.33
5. Step 5: Solve for x
   x = 1,867,954.33/2,007.09
6. Step 6: Final answer
   x = 930.68