Finding the Fourth Proportional to 2,186.72, 3,280.12 and 725.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.72 : 3,280.12 = 725.88 : x
2. Step 2: Convert to fraction form
   2,186.72/3,280.12 = 725.88/x
3. Step 3: Cross multiply
   2,186.72x = 3,280.12 × 725.88
4. Step 4: Simplify right side
   2,186.72x = 2,380,973.51
5. Step 5: Solve for x
   x = 2,380,973.51/2,186.72
6. Step 6: Final answer
   x = 1,088.83