Finding the Fourth Proportional to 1,111.40, 1,667.18 and 331.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.40 : 1,667.18 = 331.34 : x
2. Step 2: Convert to fraction form
   1,111.40/1,667.18 = 331.34/x
3. Step 3: Cross multiply
   1,111.40x = 1,667.18 × 331.34
4. Step 4: Simplify right side
   1,111.40x = 552,399.67
5. Step 5: Solve for x
   x = 552,399.67/1,111.40
6. Step 6: Final answer
   x = 497.03