Finding the Fourth Proportional to 2,188.05, 3,282.61 and 727.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.05 : 3,282.61 = 727.21 : x
2. Step 2: Convert to fraction form
   2,188.05/3,282.61 = 727.21/x
3. Step 3: Cross multiply
   2,188.05x = 3,282.61 × 727.21
4. Step 4: Simplify right side
   2,188.05x = 2,387,150.47
5. Step 5: Solve for x
   x = 2,387,150.47/2,188.05
6. Step 6: Final answer
   x = 1,091.00