Finding the Fourth Proportional to 2,405.80, 3,609.29 and 1,216.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.80 : 3,609.29 = 1,216.89 : x
2. Step 2: Convert to fraction form
   2,405.80/3,609.29 = 1,216.89/x
3. Step 3: Cross multiply
   2,405.80x = 3,609.29 × 1,216.89
4. Step 4: Simplify right side
   2,405.80x = 4,392,111.95
5. Step 5: Solve for x
   x = 4,392,111.95/2,405.80
6. Step 6: Final answer
   x = 1,825.63