Finding the Fourth Proportional to 3,111.24, 4,667.40 and 920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.24 : 4,667.40 = 920.10 : x
2. Step 2: Convert to fraction form
   3,111.24/4,667.40 = 920.10/x
3. Step 3: Cross multiply
   3,111.24x = 4,667.40 × 920.10
4. Step 4: Simplify right side
   3,111.24x = 4,294,474.74
5. Step 5: Solve for x
   x = 4,294,474.74/3,111.24
6. Step 6: Final answer
   x = 1,380.31