Finding the Fourth Proportional to 2,166.52, 2,989.77 and 1,222.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.52 : 2,989.77 = 1,222.33 : x
2. Step 2: Convert to fraction form
   2,166.52/2,989.77 = 1,222.33/x
3. Step 3: Cross multiply
   2,166.52x = 2,989.77 × 1,222.33
4. Step 4: Simplify right side
   2,166.52x = 3,654,485.56
5. Step 5: Solve for x
   x = 3,654,485.56/2,166.52
6. Step 6: Final answer
   x = 1,686.80