Finding the Fourth Proportional to 1,111.91, 1,667.61 and 331.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.91 : 1,667.61 = 331.84 : x
2. Step 2: Convert to fraction form
   1,111.91/1,667.61 = 331.84/x
3. Step 3: Cross multiply
   1,111.91x = 1,667.61 × 331.84
4. Step 4: Simplify right side
   1,111.91x = 553,369.71
5. Step 5: Solve for x
   x = 553,369.71/1,111.91
6. Step 6: Final answer
   x = 497.68