Finding the Fourth Proportional to 2,111.49, 2,913.40 and 1,215.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.49 : 2,913.40 = 1,215.34 : x
2. Step 2: Convert to fraction form
   2,111.49/2,913.40 = 1,215.34/x
3. Step 3: Cross multiply
   2,111.49x = 2,913.40 × 1,215.34
4. Step 4: Simplify right side
   2,111.49x = 3,540,771.56
5. Step 5: Solve for x
   x = 3,540,771.56/2,111.49
6. Step 6: Final answer
   x = 1,676.91