Finding the Fourth Proportional to 2,216.86, 3,325.59 and 1,228.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.86 : 3,325.59 = 1,228.91 : x
2. Step 2: Convert to fraction form
   2,216.86/3,325.59 = 1,228.91/x
3. Step 3: Cross multiply
   2,216.86x = 3,325.59 × 1,228.91
4. Step 4: Simplify right side
   2,216.86x = 4,086,850.81
5. Step 5: Solve for x
   x = 4,086,850.81/2,216.86
6. Step 6: Final answer
   x = 1,843.53