Finding the Fourth Proportional to 1,111.79, 1,667.49 and 381.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.79 : 1,667.49 = 381.26 : x
2. Step 2: Convert to fraction form
   1,111.79/1,667.49 = 381.26/x
3. Step 3: Cross multiply
   1,111.79x = 1,667.49 × 381.26
4. Step 4: Simplify right side
   1,111.79x = 635,747.24
5. Step 5: Solve for x
   x = 635,747.24/1,111.79
6. Step 6: Final answer
   x = 571.82