Finding the Fourth Proportional to 1,112.65, 1,667.15 and 381.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.65 : 1,667.15 = 381.83 : x
2. Step 2: Convert to fraction form
   1,112.65/1,667.15 = 381.83/x
3. Step 3: Cross multiply
   1,112.65x = 1,667.15 × 381.83
4. Step 4: Simplify right side
   1,112.65x = 636,567.88
5. Step 5: Solve for x
   x = 636,567.88/1,112.65
6. Step 6: Final answer
   x = 572.12