Finding the Fourth Proportional to 1,315.35, 1,815.18 and 725.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.35 : 1,815.18 = 725.89 : x
2. Step 2: Convert to fraction form
   1,315.35/1,815.18 = 725.89/x
3. Step 3: Cross multiply
   1,315.35x = 1,815.18 × 725.89
4. Step 4: Simplify right side
   1,315.35x = 1,317,621.01
5. Step 5: Solve for x
   x = 1,317,621.01/1,315.35
6. Step 6: Final answer
   x = 1,001.73