Finding the Fourth Proportional to 2,609.02, 3,910.69 and 1,221.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.02 : 3,910.69 = 1,221.49 : x
2. Step 2: Convert to fraction form
   2,609.02/3,910.69 = 1,221.49/x
3. Step 3: Cross multiply
   2,609.02x = 3,910.69 × 1,221.49
4. Step 4: Simplify right side
   2,609.02x = 4,776,868.73
5. Step 5: Solve for x
   x = 4,776,868.73/2,609.02
6. Step 6: Final answer
   x = 1,830.91