Finding the Fourth Proportional to 2,287.10, 3,431.55 and 900.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.10 : 3,431.55 = 900.20 : x
2. Step 2: Convert to fraction form
   2,287.10/3,431.55 = 900.20/x
3. Step 3: Cross multiply
   2,287.10x = 3,431.55 × 900.20
4. Step 4: Simplify right side
   2,287.10x = 3,089,081.31
5. Step 5: Solve for x
   x = 3,089,081.31/2,287.10
6. Step 6: Final answer
   x = 1,350.65