Finding the Fourth Proportional to 2,216.67, 3,321.51 and 1,289.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.67 : 3,321.51 = 1,289.89 : x
2. Step 2: Convert to fraction form
   2,216.67/3,321.51 = 1,289.89/x
3. Step 3: Cross multiply
   2,216.67x = 3,321.51 × 1,289.89
4. Step 4: Simplify right side
   2,216.67x = 4,284,382.53
5. Step 5: Solve for x
   x = 4,284,382.53/2,216.67
6. Step 6: Final answer
   x = 1,932.80