Finding the Fourth Proportional to 1,111.69, 1,667.79 and 381.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.69 : 1,667.79 = 381.27 : x
2. Step 2: Convert to fraction form
   1,111.69/1,667.79 = 381.27/x
3. Step 3: Cross multiply
   1,111.69x = 1,667.79 × 381.27
4. Step 4: Simplify right side
   1,111.69x = 635,878.29
5. Step 5: Solve for x
   x = 635,878.29/1,111.69
6. Step 6: Final answer
   x = 571.99