Finding the Fourth Proportional to 2,459.71, 3,690.20 and 816.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.71 : 3,690.20 = 816.27 : x
2. Step 2: Convert to fraction form
   2,459.71/3,690.20 = 816.27/x
3. Step 3: Cross multiply
   2,459.71x = 3,690.20 × 816.27
4. Step 4: Simplify right side
   2,459.71x = 3,012,199.55
5. Step 5: Solve for x
   x = 3,012,199.55/2,459.71
6. Step 6: Final answer
   x = 1,224.62