Finding the Fourth Proportional to 2,605.24, 3,905.72 and 1,217.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.24 : 3,905.72 = 1,217.89 : x
2. Step 2: Convert to fraction form
   2,605.24/3,905.72 = 1,217.89/x
3. Step 3: Cross multiply
   2,605.24x = 3,905.72 × 1,217.89
4. Step 4: Simplify right side
   2,605.24x = 4,756,737.33
5. Step 5: Solve for x
   x = 4,756,737.33/2,605.24
6. Step 6: Final answer
   x = 1,825.83