Finding the Fourth Proportional to 3,111.42, 4,667.91 and 920.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.42 : 4,667.91 = 920.16 : x
2. Step 2: Convert to fraction form
   3,111.42/4,667.91 = 920.16/x
3. Step 3: Cross multiply
   3,111.42x = 4,667.91 × 920.16
4. Step 4: Simplify right side
   3,111.42x = 4,295,224.07
5. Step 5: Solve for x
   x = 4,295,224.07/3,111.42
6. Step 6: Final answer
   x = 1,380.47