Finding the Fourth Proportional to 2,551.89, 3,825.71 and 991.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.89 : 3,825.71 = 991.53 : x
2. Step 2: Convert to fraction form
   2,551.89/3,825.71 = 991.53/x
3. Step 3: Cross multiply
   2,551.89x = 3,825.71 × 991.53
4. Step 4: Simplify right side
   2,551.89x = 3,793,306.24
5. Step 5: Solve for x
   x = 3,793,306.24/2,551.89
6. Step 6: Final answer
   x = 1,486.47