Finding the Fourth Proportional to 2,131.40, 3,198.33 and 898.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.40 : 3,198.33 = 898.72 : x
2. Step 2: Convert to fraction form
   2,131.40/3,198.33 = 898.72/x
3. Step 3: Cross multiply
   2,131.40x = 3,198.33 × 898.72
4. Step 4: Simplify right side
   2,131.40x = 2,874,403.14
5. Step 5: Solve for x
   x = 2,874,403.14/2,131.40
6. Step 6: Final answer
   x = 1,348.60