Finding the Fourth Proportional to 2,689.40, 3,711.42 and 1,570.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,689.40 : 3,711.42 = 1,570.59 : x
2. Step 2: Convert to fraction form
   2,689.40/3,711.42 = 1,570.59/x
3. Step 3: Cross multiply
   2,689.40x = 3,711.42 × 1,570.59
4. Step 4: Simplify right side
   2,689.40x = 5,829,119.14
5. Step 5: Solve for x
   x = 5,829,119.14/2,689.40
6. Step 6: Final answer
   x = 2,167.44