Finding the Fourth Proportional to 2,212.89, 3,053.72 and 1,218.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.89 : 3,053.72 = 1,218.03 : x
2. Step 2: Convert to fraction form
   2,212.89/3,053.72 = 1,218.03/x
3. Step 3: Cross multiply
   2,212.89x = 3,053.72 × 1,218.03
4. Step 4: Simplify right side
   2,212.89x = 3,719,525.62
5. Step 5: Solve for x
   x = 3,719,525.62/2,212.89
6. Step 6: Final answer
   x = 1,680.85