Finding the Fourth Proportional to 2,007.69, 3,011.34 and 621.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.69 : 3,011.34 = 621.03 : x
2. Step 2: Convert to fraction form
   2,007.69/3,011.34 = 621.03/x
3. Step 3: Cross multiply
   2,007.69x = 3,011.34 × 621.03
4. Step 4: Simplify right side
   2,007.69x = 1,870,132.48
5. Step 5: Solve for x
   x = 1,870,132.48/2,007.69
6. Step 6: Final answer
   x = 931.48