Finding the Fourth Proportional to 2,166.25, 2,989.72 and 1,222.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.25 : 2,989.72 = 1,222.24 : x
2. Step 2: Convert to fraction form
   2,166.25/2,989.72 = 1,222.24/x
3. Step 3: Cross multiply
   2,166.25x = 2,989.72 × 1,222.24
4. Step 4: Simplify right side
   2,166.25x = 3,654,137.37
5. Step 5: Solve for x
   x = 3,654,137.37/2,166.25
6. Step 6: Final answer
   x = 1,686.85