Finding the Fourth Proportional to 2,007.18, 3,009.99 and 690.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.18 : 3,009.99 = 690.69 : x
2. Step 2: Convert to fraction form
   2,007.18/3,009.99 = 690.69/x
3. Step 3: Cross multiply
   2,007.18x = 3,009.99 × 690.69
4. Step 4: Simplify right side
   2,007.18x = 2,078,961.30
5. Step 5: Solve for x
   x = 2,078,961.30/2,007.18
6. Step 6: Final answer
   x = 1,035.76