Finding the Fourth Proportional to 1,112.02, 1,667.62 and 381.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.02 : 1,667.62 = 381.40 : x
2. Step 2: Convert to fraction form
   1,112.02/1,667.62 = 381.40/x
3. Step 3: Cross multiply
   1,112.02x = 1,667.62 × 381.40
4. Step 4: Simplify right side
   1,112.02x = 636,030.27
5. Step 5: Solve for x
   x = 636,030.27/1,112.02
6. Step 6: Final answer
   x = 571.96