Finding the Fourth Proportional to 2,198.86, 3,298.26 and 900.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,198.86 : 3,298.26 = 900.31 : x
2. Step 2: Convert to fraction form
   2,198.86/3,298.26 = 900.31/x
3. Step 3: Cross multiply
   2,198.86x = 3,298.26 × 900.31
4. Step 4: Simplify right side
   2,198.86x = 2,969,456.46
5. Step 5: Solve for x
   x = 2,969,456.46/2,198.86
6. Step 6: Final answer
   x = 1,350.45