Finding the Fourth Proportional to 3,111.54, 4,667.81 and 920.49

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.54 : 4,667.81 = 920.49 : x
2. Step 2: Convert to fraction form
   3,111.54/4,667.81 = 920.49/x
3. Step 3: Cross multiply
   3,111.54x = 4,667.81 × 920.49
4. Step 4: Simplify right side
   3,111.54x = 4,296,649.09
5. Step 5: Solve for x
   x = 4,296,649.09/3,111.54
6. Step 6: Final answer
   x = 1,380.88