Finding the Fourth Proportional to 2,570.54, 3,547.34 and 1,391.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.54 : 3,547.34 = 1,391.61 : x
2. Step 2: Convert to fraction form
   2,570.54/3,547.34 = 1,391.61/x
3. Step 3: Cross multiply
   2,570.54x = 3,547.34 × 1,391.61
4. Step 4: Simplify right side
   2,570.54x = 4,936,517.30
5. Step 5: Solve for x
   x = 4,936,517.30/2,570.54
6. Step 6: Final answer
   x = 1,920.42