Finding the Fourth Proportional to 2,275.97, 3,139.20 and 1,605.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.97 : 3,139.20 = 1,605.15 : x
2. Step 2: Convert to fraction form
   2,275.97/3,139.20 = 1,605.15/x
3. Step 3: Cross multiply
   2,275.97x = 3,139.20 × 1,605.15
4. Step 4: Simplify right side
   2,275.97x = 5,038,898.65
5. Step 5: Solve for x
   x = 5,038,898.65/2,275.97
6. Step 6: Final answer
   x = 2,213.96