Finding the Fourth Proportional to 2,212.80, 3,053.52 and 1,218.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.80 : 3,053.52 = 1,218.04 : x
2. Step 2: Convert to fraction form
   2,212.80/3,053.52 = 1,218.04/x
3. Step 3: Cross multiply
   2,212.80x = 3,053.52 × 1,218.04
4. Step 4: Simplify right side
   2,212.80x = 3,719,309.50
5. Step 5: Solve for x
   x = 3,719,309.50/2,212.80
6. Step 6: Final answer
   x = 1,680.82