Finding the Fourth Proportional to 2,007.78, 3,010.56 and 620.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.78 : 3,010.56 = 620.73 : x
2. Step 2: Convert to fraction form
   2,007.78/3,010.56 = 620.73/x
3. Step 3: Cross multiply
   2,007.78x = 3,010.56 × 620.73
4. Step 4: Simplify right side
   2,007.78x = 1,868,744.91
5. Step 5: Solve for x
   x = 1,868,744.91/2,007.78
6. Step 6: Final answer
   x = 930.75