Finding the Fourth Proportional to 2,673.72, 4,010.78 and 725.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,673.72 : 4,010.78 = 725.90 : x
2. Step 2: Convert to fraction form
   2,673.72/4,010.78 = 725.90/x
3. Step 3: Cross multiply
   2,673.72x = 4,010.78 × 725.90
4. Step 4: Simplify right side
   2,673.72x = 2,911,406.96
5. Step 5: Solve for x
   x = 2,911,406.96/2,673.72
6. Step 6: Final answer
   x = 1,088.90