Finding the Fourth Proportional to 2,057.40, 2,839.35 and 1,217.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.40 : 2,839.35 = 1,217.94 : x
2. Step 2: Convert to fraction form
   2,057.40/2,839.35 = 1,217.94/x
3. Step 3: Cross multiply
   2,057.40x = 2,839.35 × 1,217.94
4. Step 4: Simplify right side
   2,057.40x = 3,458,157.94
5. Step 5: Solve for x
   x = 3,458,157.94/2,057.40
6. Step 6: Final answer
   x = 1,680.84