Finding the Fourth Proportional to 1,112.24, 1,667.87 and 381.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.24 : 1,667.87 = 381.89 : x
2. Step 2: Convert to fraction form
   1,112.24/1,667.87 = 381.89/x
3. Step 3: Cross multiply
   1,112.24x = 1,667.87 × 381.89
4. Step 4: Simplify right side
   1,112.24x = 636,932.63
5. Step 5: Solve for x
   x = 636,932.63/1,112.24
6. Step 6: Final answer
   x = 572.66