Finding the Fourth Proportional to 2,570.48, 3,547.27 and 1,391.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.48 : 3,547.27 = 1,391.55 : x
2. Step 2: Convert to fraction form
   2,570.48/3,547.27 = 1,391.55/x
3. Step 3: Cross multiply
   2,570.48x = 3,547.27 × 1,391.55
4. Step 4: Simplify right side
   2,570.48x = 4,936,218.02
5. Step 5: Solve for x
   x = 4,936,218.02/2,570.48
6. Step 6: Final answer
   x = 1,920.35