Finding the Fourth Proportional to 1,111.20, 1,667.16 and 381.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.20 : 1,667.16 = 381.24 : x
2. Step 2: Convert to fraction form
   1,111.20/1,667.16 = 381.24/x
3. Step 3: Cross multiply
   1,111.20x = 1,667.16 × 381.24
4. Step 4: Simplify right side
   1,111.20x = 635,588.08
5. Step 5: Solve for x
   x = 635,588.08/1,111.20
6. Step 6: Final answer
   x = 571.98