Finding the Fourth Proportional to 1,290.83, 1,935.63 and 674.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.83 : 1,935.63 = 674.42 : x
2. Step 2: Convert to fraction form
   1,290.83/1,935.63 = 674.42/x
3. Step 3: Cross multiply
   1,290.83x = 1,935.63 × 674.42
4. Step 4: Simplify right side
   1,290.83x = 1,305,417.91
5. Step 5: Solve for x
   x = 1,305,417.91/1,290.83
6. Step 6: Final answer
   x = 1,011.31