Finding the Fourth Proportional to 2,142.68, 2,956.71 and 1,198.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.68 : 2,956.71 = 1,198.39 : x
2. Step 2: Convert to fraction form
   2,142.68/2,956.71 = 1,198.39/x
3. Step 3: Cross multiply
   2,142.68x = 2,956.71 × 1,198.39
4. Step 4: Simplify right side
   2,142.68x = 3,543,291.70
5. Step 5: Solve for x
   x = 3,543,291.70/2,142.68
6. Step 6: Final answer
   x = 1,653.67