Finding the Fourth Proportional to 1,112.73, 1,668.83 and 419.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.73 : 1,668.83 = 419.46 : x
2. Step 2: Convert to fraction form
   1,112.73/1,668.83 = 419.46/x
3. Step 3: Cross multiply
   1,112.73x = 1,668.83 × 419.46
4. Step 4: Simplify right side
   1,112.73x = 700,005.33
5. Step 5: Solve for x
   x = 700,005.33/1,112.73
6. Step 6: Final answer
   x = 629.09