Finding the Fourth Proportional to 2,570.90, 3,547.83 and 1,391.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.90 : 3,547.83 = 1,391.96 : x
2. Step 2: Convert to fraction form
   2,570.90/3,547.83 = 1,391.96/x
3. Step 3: Cross multiply
   2,570.90x = 3,547.83 × 1,391.96
4. Step 4: Simplify right side
   2,570.90x = 4,938,437.45
5. Step 5: Solve for x
   x = 4,938,437.45/2,570.90
6. Step 6: Final answer
   x = 1,920.90