Finding the Fourth Proportional to 2,287.48, 3,431.40 and 900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.48 : 3,431.40 = 900.72 : x
2. Step 2: Convert to fraction form
   2,287.48/3,431.40 = 900.72/x
3. Step 3: Cross multiply
   2,287.48x = 3,431.40 × 900.72
4. Step 4: Simplify right side
   2,287.48x = 3,090,730.61
5. Step 5: Solve for x
   x = 3,090,730.61/2,287.48
6. Step 6: Final answer
   x = 1,351.15