Finding the Fourth Proportional to 1,699.88, 2,550.56 and 725.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,699.88 : 2,550.56 = 725.72 : x
2. Step 2: Convert to fraction form
   1,699.88/2,550.56 = 725.72/x
3. Step 3: Cross multiply
   1,699.88x = 2,550.56 × 725.72
4. Step 4: Simplify right side
   1,699.88x = 1,850,992.40
5. Step 5: Solve for x
   x = 1,850,992.40/1,699.88
6. Step 6: Final answer
   x = 1,088.90