Finding the Fourth Proportional to 2,213.30, 3,054.38 and 1,218.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.30 : 3,054.38 = 1,218.56 : x
2. Step 2: Convert to fraction form
   2,213.30/3,054.38 = 1,218.56/x
3. Step 3: Cross multiply
   2,213.30x = 3,054.38 × 1,218.56
4. Step 4: Simplify right side
   2,213.30x = 3,721,945.29
5. Step 5: Solve for x
   x = 3,721,945.29/2,213.30
6. Step 6: Final answer
   x = 1,681.63