Finding the Fourth Proportional to 1,290.72, 1,934.48 and 674.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.72 : 1,934.48 = 674.10 : x
2. Step 2: Convert to fraction form
   1,290.72/1,934.48 = 674.10/x
3. Step 3: Cross multiply
   1,290.72x = 1,934.48 × 674.10
4. Step 4: Simplify right side
   1,290.72x = 1,304,032.97
5. Step 5: Solve for x
   x = 1,304,032.97/1,290.72
6. Step 6: Final answer
   x = 1,010.31