Finding the Fourth Proportional to 2,167.05, 2,990.37 and 1,222.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.05 : 2,990.37 = 1,222.54 : x
2. Step 2: Convert to fraction form
   2,167.05/2,990.37 = 1,222.54/x
3. Step 3: Cross multiply
   2,167.05x = 2,990.37 × 1,222.54
4. Step 4: Simplify right side
   2,167.05x = 3,655,846.94
5. Step 5: Solve for x
   x = 3,655,846.94/2,167.05
6. Step 6: Final answer
   x = 1,687.02