Finding the Fourth Proportional to 1,315.56, 1,815.39 and 725.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.56 : 1,815.39 = 725.99 : x
2. Step 2: Convert to fraction form
   1,315.56/1,815.39 = 725.99/x
3. Step 3: Cross multiply
   1,315.56x = 1,815.39 × 725.99
4. Step 4: Simplify right side
   1,315.56x = 1,317,945.91
5. Step 5: Solve for x
   x = 1,317,945.91/1,315.56
6. Step 6: Final answer
   x = 1,001.81