Finding the Fourth Proportional to 1,111.76, 1,667.33 and 381.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.76 : 1,667.33 = 381.09 : x
2. Step 2: Convert to fraction form
   1,111.76/1,667.33 = 381.09/x
3. Step 3: Cross multiply
   1,111.76x = 1,667.33 × 381.09
4. Step 4: Simplify right side
   1,111.76x = 635,402.79
5. Step 5: Solve for x
   x = 635,402.79/1,111.76
6. Step 6: Final answer
   x = 571.53