Finding the Fourth Proportional to 2,185.39, 3,278.62 and 724.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.39 : 3,278.62 = 724.69 : x
2. Step 2: Convert to fraction form
   2,185.39/3,278.62 = 724.69/x
3. Step 3: Cross multiply
   2,185.39x = 3,278.62 × 724.69
4. Step 4: Simplify right side
   2,185.39x = 2,375,983.13
5. Step 5: Solve for x
   x = 2,375,983.13/2,185.39
6. Step 6: Final answer
   x = 1,087.21