Finding the Fourth Proportional to 3,111.84, 4,667.49 and 920.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.84 : 4,667.49 = 920.34 : x
2. Step 2: Convert to fraction form
   3,111.84/4,667.49 = 920.34/x
3. Step 3: Cross multiply
   3,111.84x = 4,667.49 × 920.34
4. Step 4: Simplify right side
   3,111.84x = 4,295,677.75
5. Step 5: Solve for x
   x = 4,295,677.75/3,111.84
6. Step 6: Final answer
   x = 1,380.43