Finding the Fourth Proportional to 1,112.39, 1,667.42 and 381.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.39 : 1,667.42 = 381.56 : x
2. Step 2: Convert to fraction form
   1,112.39/1,667.42 = 381.56/x
3. Step 3: Cross multiply
   1,112.39x = 1,667.42 × 381.56
4. Step 4: Simplify right side
   1,112.39x = 636,210.53
5. Step 5: Solve for x
   x = 636,210.53/1,112.39
6. Step 6: Final answer
   x = 571.93