Finding the Fourth Proportional to 2,459.67, 3,690.59 and 816.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.67 : 3,690.59 = 816.45 : x
2. Step 2: Convert to fraction form
   2,459.67/3,690.59 = 816.45/x
3. Step 3: Cross multiply
   2,459.67x = 3,690.59 × 816.45
4. Step 4: Simplify right side
   2,459.67x = 3,013,178.12
5. Step 5: Solve for x
   x = 3,013,178.12/2,459.67
6. Step 6: Final answer
   x = 1,225.03