Finding the Fourth Proportional to 2,551.86, 3,825.56 and 990.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.86 : 3,825.56 = 990.79 : x
2. Step 2: Convert to fraction form
   2,551.86/3,825.56 = 990.79/x
3. Step 3: Cross multiply
   2,551.86x = 3,825.56 × 990.79
4. Step 4: Simplify right side
   2,551.86x = 3,790,319.51
5. Step 5: Solve for x
   x = 3,790,319.51/2,551.86
6. Step 6: Final answer
   x = 1,485.32