Finding the Fourth Proportional to 2,791.18, 4,185.78 and 816.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,791.18 : 4,185.78 = 816.25 : x
2. Step 2: Convert to fraction form
   2,791.18/4,185.78 = 816.25/x
3. Step 3: Cross multiply
   2,791.18x = 4,185.78 × 816.25
4. Step 4: Simplify right side
   2,791.18x = 3,416,642.93
5. Step 5: Solve for x
   x = 3,416,642.93/2,791.18
6. Step 6: Final answer
   x = 1,224.09