Finding the Fourth Proportional to 2,166.58, 2,989.91 and 1,222.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.58 : 2,989.91 = 1,222.29 : x
2. Step 2: Convert to fraction form
   2,166.58/2,989.91 = 1,222.29/x
3. Step 3: Cross multiply
   2,166.58x = 2,989.91 × 1,222.29
4. Step 4: Simplify right side
   2,166.58x = 3,654,524.03
5. Step 5: Solve for x
   x = 3,654,524.03/2,166.58
6. Step 6: Final answer
   x = 1,686.77