Finding the Fourth Proportional to 1,765.58, 2,648.31 and 725.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,765.58 : 2,648.31 = 725.31 : x
2. Step 2: Convert to fraction form
   1,765.58/2,648.31 = 725.31/x
3. Step 3: Cross multiply
   1,765.58x = 2,648.31 × 725.31
4. Step 4: Simplify right side
   1,765.58x = 1,920,845.73
5. Step 5: Solve for x
   x = 1,920,845.73/1,765.58
6. Step 6: Final answer
   x = 1,087.94