Finding the Fourth Proportional to 2,007.30, 3,010.17 and 690.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.30 : 3,010.17 = 690.78 : x
2. Step 2: Convert to fraction form
   2,007.30/3,010.17 = 690.78/x
3. Step 3: Cross multiply
   2,007.30x = 3,010.17 × 690.78
4. Step 4: Simplify right side
   2,007.30x = 2,079,365.23
5. Step 5: Solve for x
   x = 2,079,365.23/2,007.30
6. Step 6: Final answer
   x = 1,035.90