Finding the Fourth Proportional to 3,144.71, 4,689.63 and 2,790.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,144.71 : 4,689.63 = 2,790.69 : x
2. Step 2: Convert to fraction form
   3,144.71/4,689.63 = 2,790.69/x
3. Step 3: Cross multiply
   3,144.71x = 4,689.63 × 2,790.69
4. Step 4: Simplify right side
   3,144.71x = 13,087,303.54
5. Step 5: Solve for x
   x = 13,087,303.54/3,144.71
6. Step 6: Final answer
   x = 4,161.70