Finding the Fourth Proportional to 2,008.10, 2,771.40 and 1,222.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,008.10 : 2,771.40 = 1,222.13 : x
2. Step 2: Convert to fraction form
   2,008.10/2,771.40 = 1,222.13/x
3. Step 3: Cross multiply
   2,008.10x = 2,771.40 × 1,222.13
4. Step 4: Simplify right side
   2,008.10x = 3,386,997.23
5. Step 5: Solve for x
   x = 3,386,997.23/2,008.10
6. Step 6: Final answer
   x = 1,686.67