Finding the Fourth Proportional to 2,549.71, 3,825.63 and 990.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,549.71 : 3,825.63 = 990.80 : x
2. Step 2: Convert to fraction form
   2,549.71/3,825.63 = 990.80/x
3. Step 3: Cross multiply
   2,549.71x = 3,825.63 × 990.80
4. Step 4: Simplify right side
   2,549.71x = 3,790,429.42
5. Step 5: Solve for x
   x = 3,790,429.42/2,549.71
6. Step 6: Final answer
   x = 1,486.61