Finding the Fourth Proportional to 2,570.65, 3,547.47 and 1,391.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.65 : 3,547.47 = 1,391.72 : x
2. Step 2: Convert to fraction form
   2,570.65/3,547.47 = 1,391.72/x
3. Step 3: Cross multiply
   2,570.65x = 3,547.47 × 1,391.72
4. Step 4: Simplify right side
   2,570.65x = 4,937,084.95
5. Step 5: Solve for x
   x = 4,937,084.95/2,570.65
6. Step 6: Final answer
   x = 1,920.56