Finding the Fourth Proportional to 1,111.41, 1,666.86 and 331.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.41 : 1,666.86 = 331.34 : x
2. Step 2: Convert to fraction form
   1,111.41/1,666.86 = 331.34/x
3. Step 3: Cross multiply
   1,111.41x = 1,666.86 × 331.34
4. Step 4: Simplify right side
   1,111.41x = 552,287.40
5. Step 5: Solve for x
   x = 552,287.40/1,111.41
6. Step 6: Final answer
   x = 496.93