Finding the Fourth Proportional to 2,112.45, 2,914 and 1,228.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.45 : 2,914 = 1,228.15 : x
2. Step 2: Convert to fraction form
   2,112.45/2,914 = 1,228.15/x
3. Step 3: Cross multiply
   2,112.45x = 2,914 × 1,228.15
4. Step 4: Simplify right side
   2,112.45x = 3,578,829.10
5. Step 5: Solve for x
   x = 3,578,829.10/2,112.45
6. Step 6: Final answer
   x = 1,694.16