Finding the Fourth Proportional to 2,570.09, 3,546.72 and 1,391.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.09 : 3,546.72 = 1,391.15 : x
2. Step 2: Convert to fraction form
   2,570.09/3,546.72 = 1,391.15/x
3. Step 3: Cross multiply
   2,570.09x = 3,546.72 × 1,391.15
4. Step 4: Simplify right side
   2,570.09x = 4,934,028.39
5. Step 5: Solve for x
   x = 4,934,028.39/2,570.09
6. Step 6: Final answer
   x = 1,919.79