Finding the Fourth Proportional to 2,166.22, 2,989.32 and 1,222.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.22 : 2,989.32 = 1,222.00 : x
2. Step 2: Convert to fraction form
   2,166.22/2,989.32 = 1,222.00/x
3. Step 3: Cross multiply
   2,166.22x = 2,989.32 × 1,222.00
4. Step 4: Simplify right side
   2,166.22x = 3,652,942.91
5. Step 5: Solve for x
   x = 3,652,942.91/2,166.22
6. Step 6: Final answer
   x = 1,686.32