Finding the Fourth Proportional to 1,315.34, 1,815.15 and 725.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.34 : 1,815.15 = 725.86 : x
2. Step 2: Convert to fraction form
   1,315.34/1,815.15 = 725.86/x
3. Step 3: Cross multiply
   1,315.34x = 1,815.15 × 725.86
4. Step 4: Simplify right side
   1,315.34x = 1,317,540.24
5. Step 5: Solve for x
   x = 1,317,540.24/1,315.34
6. Step 6: Final answer
   x = 1,001.68