Finding the Fourth Proportional to 2,112.18, 3,168.54 and 814.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.18 : 3,168.54 = 814.02 : x
2. Step 2: Convert to fraction form
   2,112.18/3,168.54 = 814.02/x
3. Step 3: Cross multiply
   2,112.18x = 3,168.54 × 814.02
4. Step 4: Simplify right side
   2,112.18x = 2,579,254.93
5. Step 5: Solve for x
   x = 2,579,254.93/2,112.18
6. Step 6: Final answer
   x = 1,221.13