Finding the Fourth Proportional to 2,111.14, 2,913.53 and 1,215.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.14 : 2,913.53 = 1,215.15 : x
2. Step 2: Convert to fraction form
   2,111.14/2,913.53 = 1,215.15/x
3. Step 3: Cross multiply
   2,111.14x = 2,913.53 × 1,215.15
4. Step 4: Simplify right side
   2,111.14x = 3,540,383.91
5. Step 5: Solve for x
   x = 3,540,383.91/2,111.14
6. Step 6: Final answer
   x = 1,677.00