Finding the Fourth Proportional to 2,131.40, 3,198.47 and 898.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.40 : 3,198.47 = 898.81 : x
2. Step 2: Convert to fraction form
   2,131.40/3,198.47 = 898.81/x
3. Step 3: Cross multiply
   2,131.40x = 3,198.47 × 898.81
4. Step 4: Simplify right side
   2,131.40x = 2,874,822.32
5. Step 5: Solve for x
   x = 2,874,822.32/2,131.40
6. Step 6: Final answer
   x = 1,348.80