Finding the Fourth Proportional to 2,008.20, 2,770.77 and 1,221.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,008.20 : 2,770.77 = 1,221.69 : x
2. Step 2: Convert to fraction form
   2,008.20/2,770.77 = 1,221.69/x
3. Step 3: Cross multiply
   2,008.20x = 2,770.77 × 1,221.69
4. Step 4: Simplify right side
   2,008.20x = 3,385,007.03
5. Step 5: Solve for x
   x = 3,385,007.03/2,008.20
6. Step 6: Final answer
   x = 1,685.60