Finding the Fourth Proportional to 2,105.94, 3,157.83 and 1,228.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.94 : 3,157.83 = 1,228.72 : x
2. Step 2: Convert to fraction form
   2,105.94/3,157.83 = 1,228.72/x
3. Step 3: Cross multiply
   2,105.94x = 3,157.83 × 1,228.72
4. Step 4: Simplify right side
   2,105.94x = 3,880,088.88
5. Step 5: Solve for x
   x = 3,880,088.88/2,105.94
6. Step 6: Final answer
   x = 1,842.45