Finding the Fourth Proportional to 1,112.72, 1,668.72 and 382.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.72 : 1,668.72 = 382.28 : x
2. Step 2: Convert to fraction form
   1,112.72/1,668.72 = 382.28/x
3. Step 3: Cross multiply
   1,112.72x = 1,668.72 × 382.28
4. Step 4: Simplify right side
   1,112.72x = 637,918.28
5. Step 5: Solve for x
   x = 637,918.28/1,112.72
6. Step 6: Final answer
   x = 573.30