Finding the Fourth Proportional to 3,111.17, 4,667.42 and 920.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.17 : 4,667.42 = 920.07 : x
2. Step 2: Convert to fraction form
   3,111.17/4,667.42 = 920.07/x
3. Step 3: Cross multiply
   3,111.17x = 4,667.42 × 920.07
4. Step 4: Simplify right side
   3,111.17x = 4,294,355.42
5. Step 5: Solve for x
   x = 4,294,355.42/3,111.17
6. Step 6: Final answer
   x = 1,380.30