Finding the Fourth Proportional to 2,212.83, 3,053.91 and 1,218.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.83 : 3,053.91 = 1,218.31 : x
2. Step 2: Convert to fraction form
   2,212.83/3,053.91 = 1,218.31/x
3. Step 3: Cross multiply
   2,212.83x = 3,053.91 × 1,218.31
4. Step 4: Simplify right side
   2,212.83x = 3,720,609.09
5. Step 5: Solve for x
   x = 3,720,609.09/2,212.83
6. Step 6: Final answer
   x = 1,681.38