Finding the Fourth Proportional to 1,111.86, 1,667.98 and 381.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.86 : 1,667.98 = 381.38 : x
2. Step 2: Convert to fraction form
   1,111.86/1,667.98 = 381.38/x
3. Step 3: Cross multiply
   1,111.86x = 1,667.98 × 381.38
4. Step 4: Simplify right side
   1,111.86x = 636,134.21
5. Step 5: Solve for x
   x = 636,134.21/1,111.86
6. Step 6: Final answer
   x = 572.14