Finding the Fourth Proportional to 2,290.20, 3,432.60 and 902.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.20 : 3,432.60 = 902.82 : x
2. Step 2: Convert to fraction form
   2,290.20/3,432.60 = 902.82/x
3. Step 3: Cross multiply
   2,290.20x = 3,432.60 × 902.82
4. Step 4: Simplify right side
   2,290.20x = 3,099,019.93
5. Step 5: Solve for x
   x = 3,099,019.93/2,290.20
6. Step 6: Final answer
   x = 1,353.17