Finding the Fourth Proportional to 1,315.71, 1,815.69 and 726.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.71 : 1,815.69 = 726.25 : x
2. Step 2: Convert to fraction form
   1,315.71/1,815.69 = 726.25/x
3. Step 3: Cross multiply
   1,315.71x = 1,815.69 × 726.25
4. Step 4: Simplify right side
   1,315.71x = 1,318,644.86
5. Step 5: Solve for x
   x = 1,318,644.86/1,315.71
6. Step 6: Final answer
   x = 1,002.23