Finding the Fourth Proportional to 1,111.93, 1,667.79 and 381.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.93 : 1,667.79 = 381.42 : x
2. Step 2: Convert to fraction form
   1,111.93/1,667.79 = 381.42/x
3. Step 3: Cross multiply
   1,111.93x = 1,667.79 × 381.42
4. Step 4: Simplify right side
   1,111.93x = 636,128.46
5. Step 5: Solve for x
   x = 636,128.46/1,111.93
6. Step 6: Final answer
   x = 572.10