Finding the Fourth Proportional to 2,112.34, 2,914.89 and 1,228

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.34 : 2,914.89 = 1,228 : x
2. Step 2: Convert to fraction form
   2,112.34/2,914.89 = 1,228/x
3. Step 3: Cross multiply
   2,112.34x = 2,914.89 × 1,228
4. Step 4: Simplify right side
   2,112.34x = 3,579,484.92
5. Step 5: Solve for x
   x = 3,579,484.92/2,112.34
6. Step 6: Final answer
   x = 1,694.56