Finding the Fourth Proportional to 2,153.34, 3,227.78 and 920.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.34 : 3,227.78 = 920.92 : x
2. Step 2: Convert to fraction form
   2,153.34/3,227.78 = 920.92/x
3. Step 3: Cross multiply
   2,153.34x = 3,227.78 × 920.92
4. Step 4: Simplify right side
   2,153.34x = 2,972,527.16
5. Step 5: Solve for x
   x = 2,972,527.16/2,153.34
6. Step 6: Final answer
   x = 1,380.43