Finding the Fourth Proportional to 2,792.76, 4,188.72 and 817.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,792.76 : 4,188.72 = 817.86 : x
2. Step 2: Convert to fraction form
   2,792.76/4,188.72 = 817.86/x
3. Step 3: Cross multiply
   2,792.76x = 4,188.72 × 817.86
4. Step 4: Simplify right side
   2,792.76x = 3,425,786.54
5. Step 5: Solve for x
   x = 3,425,786.54/2,792.76
6. Step 6: Final answer
   x = 1,226.67