Finding the Fourth Proportional to 2,112.49, 2,914.78 and 1,216.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.49 : 2,914.78 = 1,216.34 : x
2. Step 2: Convert to fraction form
   2,112.49/2,914.78 = 1,216.34/x
3. Step 3: Cross multiply
   2,112.49x = 2,914.78 × 1,216.34
4. Step 4: Simplify right side
   2,112.49x = 3,545,363.51
5. Step 5: Solve for x
   x = 3,545,363.51/2,112.49
6. Step 6: Final answer
   x = 1,678.29