Finding the Fourth Proportional to 1,111.63, 1,667.16 and 331.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.63 : 1,667.16 = 331.45 : x
2. Step 2: Convert to fraction form
   1,111.63/1,667.16 = 331.45/x
3. Step 3: Cross multiply
   1,111.63x = 1,667.16 × 331.45
4. Step 4: Simplify right side
   1,111.63x = 552,580.18
5. Step 5: Solve for x
   x = 552,580.18/1,111.63
6. Step 6: Final answer
   x = 497.09