Finding the Fourth Proportional to 1,111.68, 1,667.16 and 331.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.68 : 1,667.16 = 331.38 : x
2. Step 2: Convert to fraction form
   1,111.68/1,667.16 = 331.38/x
3. Step 3: Cross multiply
   1,111.68x = 1,667.16 × 331.38
4. Step 4: Simplify right side
   1,111.68x = 552,463.48
5. Step 5: Solve for x
   x = 552,463.48/1,111.68
6. Step 6: Final answer
   x = 496.96