Finding the Fourth Proportional to 3,111.75, 4,665.98 and 920.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.75 : 4,665.98 = 920.18 : x
2. Step 2: Convert to fraction form
   3,111.75/4,665.98 = 920.18/x
3. Step 3: Cross multiply
   3,111.75x = 4,665.98 × 920.18
4. Step 4: Simplify right side
   3,111.75x = 4,293,513.55
5. Step 5: Solve for x
   x = 4,293,513.55/3,111.75
6. Step 6: Final answer
   x = 1,379.77