Finding the Fourth Proportional to 1,111.53, 1,667.19 and 381.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.53 : 1,667.19 = 381.18 : x
2. Step 2: Convert to fraction form
   1,111.53/1,667.19 = 381.18/x
3. Step 3: Cross multiply
   1,111.53x = 1,667.19 × 381.18
4. Step 4: Simplify right side
   1,111.53x = 635,499.48
5. Step 5: Solve for x
   x = 635,499.48/1,111.53
6. Step 6: Final answer
   x = 571.73