Finding the Fourth Proportional to 1,648.28, 2,275.61 and 1,315.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.28 : 2,275.61 = 1,315.37 : x
2. Step 2: Convert to fraction form
   1,648.28/2,275.61 = 1,315.37/x
3. Step 3: Cross multiply
   1,648.28x = 2,275.61 × 1,315.37
4. Step 4: Simplify right side
   1,648.28x = 2,993,251.17
5. Step 5: Solve for x
   x = 2,993,251.17/1,648.28
6. Step 6: Final answer
   x = 1,815.99