Finding the Fourth Proportional to 2,459.21, 3,690.59 and 1,209.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.21 : 3,690.59 = 1,209.53 : x
2. Step 2: Convert to fraction form
   2,459.21/3,690.59 = 1,209.53/x
3. Step 3: Cross multiply
   2,459.21x = 3,690.59 × 1,209.53
4. Step 4: Simplify right side
   2,459.21x = 4,463,885.90
5. Step 5: Solve for x
   x = 4,463,885.90/2,459.21
6. Step 6: Final answer
   x = 1,815.17