Finding the Fourth Proportional to 2,791.96, 4,187.98 and 817.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,791.96 : 4,187.98 = 817.72 : x
2. Step 2: Convert to fraction form
   2,791.96/4,187.98 = 817.72/x
3. Step 3: Cross multiply
   2,791.96x = 4,187.98 × 817.72
4. Step 4: Simplify right side
   2,791.96x = 3,424,595.01
5. Step 5: Solve for x
   x = 3,424,595.01/2,791.96
6. Step 6: Final answer
   x = 1,226.59