Finding the Fourth Proportional to 2,617.32, 3,922.79 and 1,228.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.32 : 3,922.79 = 1,228.80 : x
2. Step 2: Convert to fraction form
   2,617.32/3,922.79 = 1,228.80/x
3. Step 3: Cross multiply
   2,617.32x = 3,922.79 × 1,228.80
4. Step 4: Simplify right side
   2,617.32x = 4,820,336.37
5. Step 5: Solve for x
   x = 4,820,336.37/2,617.32
6. Step 6: Final answer
   x = 1,841.71