Finding the Fourth Proportional to 1,111.62, 1,667.56 and 331.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.62 : 1,667.56 = 331.68 : x
2. Step 2: Convert to fraction form
   1,111.62/1,667.56 = 331.68/x
3. Step 3: Cross multiply
   1,111.62x = 1,667.56 × 331.68
4. Step 4: Simplify right side
   1,111.62x = 553,096.30
5. Step 5: Solve for x
   x = 553,096.30/1,111.62
6. Step 6: Final answer
   x = 497.56