Finding the Fourth Proportional to 2,605.98, 3,903.72 and 1,217.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.98 : 3,903.72 = 1,217.40 : x
2. Step 2: Convert to fraction form
   2,605.98/3,903.72 = 1,217.40/x
3. Step 3: Cross multiply
   2,605.98x = 3,903.72 × 1,217.40
4. Step 4: Simplify right side
   2,605.98x = 4,752,388.73
5. Step 5: Solve for x
   x = 4,752,388.73/2,605.98
6. Step 6: Final answer
   x = 1,823.65