Finding the Fourth Proportional to 1,139.69, 1,708.27 and 446.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.69 : 1,708.27 = 446.03 : x
2. Step 2: Convert to fraction form
   1,139.69/1,708.27 = 446.03/x
3. Step 3: Cross multiply
   1,139.69x = 1,708.27 × 446.03
4. Step 4: Simplify right side
   1,139.69x = 761,939.67
5. Step 5: Solve for x
   x = 761,939.67/1,139.69
6. Step 6: Final answer
   x = 668.55