Finding the Fourth Proportional to 2,212.86, 3,053.77 and 1,218.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.86 : 3,053.77 = 1,218.12 : x
2. Step 2: Convert to fraction form
   2,212.86/3,053.77 = 1,218.12/x
3. Step 3: Cross multiply
   2,212.86x = 3,053.77 × 1,218.12
4. Step 4: Simplify right side
   2,212.86x = 3,719,858.31
5. Step 5: Solve for x
   x = 3,719,858.31/2,212.86
6. Step 6: Final answer
   x = 1,681.02