Finding the Fourth Proportional to 1,112.27, 1,667.85 and 381.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.27 : 1,667.85 = 381.59 : x
2. Step 2: Convert to fraction form
   1,112.27/1,667.85 = 381.59/x
3. Step 3: Cross multiply
   1,112.27x = 1,667.85 × 381.59
4. Step 4: Simplify right side
   1,112.27x = 636,434.88
5. Step 5: Solve for x
   x = 636,434.88/1,112.27
6. Step 6: Final answer
   x = 572.19