Finding the Fourth Proportional to 2,185.85, 3,278.01 and 724.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.85 : 3,278.01 = 724.61 : x
2. Step 2: Convert to fraction form
   2,185.85/3,278.01 = 724.61/x
3. Step 3: Cross multiply
   2,185.85x = 3,278.01 × 724.61
4. Step 4: Simplify right side
   2,185.85x = 2,375,278.83
5. Step 5: Solve for x
   x = 2,375,278.83/2,185.85
6. Step 6: Final answer
   x = 1,086.66