Finding the Fourth Proportional to 1,111.32, 1,667.05 and 381.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.32 : 1,667.05 = 381.41 : x
2. Step 2: Convert to fraction form
   1,111.32/1,667.05 = 381.41/x
3. Step 3: Cross multiply
   1,111.32x = 1,667.05 × 381.41
4. Step 4: Simplify right side
   1,111.32x = 635,826.50
5. Step 5: Solve for x
   x = 635,826.50/1,111.32
6. Step 6: Final answer
   x = 572.14