Finding the Fourth Proportional to 1,315.62, 1,815.55 and 726.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.62 : 1,815.55 = 726.15 : x
2. Step 2: Convert to fraction form
   1,315.62/1,815.55 = 726.15/x
3. Step 3: Cross multiply
   1,315.62x = 1,815.55 × 726.15
4. Step 4: Simplify right side
   1,315.62x = 1,318,367.14
5. Step 5: Solve for x
   x = 1,318,367.14/1,315.62
6. Step 6: Final answer
   x = 1,002.09