Finding the Fourth Proportional to 2,153.88, 3,228.34 and 920.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.88 : 3,228.34 = 920.52 : x
2. Step 2: Convert to fraction form
   2,153.88/3,228.34 = 920.52/x
3. Step 3: Cross multiply
   2,153.88x = 3,228.34 × 920.52
4. Step 4: Simplify right side
   2,153.88x = 2,971,751.54
5. Step 5: Solve for x
   x = 2,971,751.54/2,153.88
6. Step 6: Final answer
   x = 1,379.72