Finding the Fourth Proportional to 2,213.31, 3,054.33 and 1,218.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.31 : 3,054.33 = 1,218.57 : x
2. Step 2: Convert to fraction form
   2,213.31/3,054.33 = 1,218.57/x
3. Step 3: Cross multiply
   2,213.31x = 3,054.33 × 1,218.57
4. Step 4: Simplify right side
   2,213.31x = 3,721,915.47
5. Step 5: Solve for x
   x = 3,721,915.47/2,213.31
6. Step 6: Final answer
   x = 1,681.60