Finding the Fourth Proportional to 2,672.72, 4,009.35 and 725.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.72 : 4,009.35 = 725.12 : x
2. Step 2: Convert to fraction form
   2,672.72/4,009.35 = 725.12/x
3. Step 3: Cross multiply
   2,672.72x = 4,009.35 × 725.12
4. Step 4: Simplify right side
   2,672.72x = 2,907,259.87
5. Step 5: Solve for x
   x = 2,907,259.87/2,672.72
6. Step 6: Final answer
   x = 1,087.75