Finding the Fourth Proportional to 2,205.61, 3,308.78 and 724.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205.61 : 3,308.78 = 724.43 : x
2. Step 2: Convert to fraction form
   2,205.61/3,308.78 = 724.43/x
3. Step 3: Cross multiply
   2,205.61x = 3,308.78 × 724.43
4. Step 4: Simplify right side
   2,205.61x = 2,396,989.58
5. Step 5: Solve for x
   x = 2,396,989.58/2,205.61
6. Step 6: Final answer
   x = 1,086.77