Finding the Fourth Proportional to 2,074.50, 3,112.17 and 920.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.50 : 3,112.17 = 920.25 : x
2. Step 2: Convert to fraction form
   2,074.50/3,112.17 = 920.25/x
3. Step 3: Cross multiply
   2,074.50x = 3,112.17 × 920.25
4. Step 4: Simplify right side
   2,074.50x = 2,863,974.44
5. Step 5: Solve for x
   x = 2,863,974.44/2,074.50
6. Step 6: Final answer
   x = 1,380.56