Finding the Fourth Proportional to 2,185.92, 3,280.50 and 1,212.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.92 : 3,280.50 = 1,212.84 : x
2. Step 2: Convert to fraction form
   2,185.92/3,280.50 = 1,212.84/x
3. Step 3: Cross multiply
   2,185.92x = 3,280.50 × 1,212.84
4. Step 4: Simplify right side
   2,185.92x = 3,978,721.62
5. Step 5: Solve for x
   x = 3,978,721.62/2,185.92
6. Step 6: Final answer
   x = 1,820.16