Finding the Fourth Proportional to 2,152.85, 3,229.59 and 920.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.85 : 3,229.59 = 920.25 : x
2. Step 2: Convert to fraction form
   2,152.85/3,229.59 = 920.25/x
3. Step 3: Cross multiply
   2,152.85x = 3,229.59 × 920.25
4. Step 4: Simplify right side
   2,152.85x = 2,972,030.20
5. Step 5: Solve for x
   x = 2,972,030.20/2,152.85
6. Step 6: Final answer
   x = 1,380.51