Finding the Fourth Proportional to 2,213.35, 3,054.38 and 1,218.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.35 : 3,054.38 = 1,218.60 : x
2. Step 2: Convert to fraction form
   2,213.35/3,054.38 = 1,218.60/x
3. Step 3: Cross multiply
   2,213.35x = 3,054.38 × 1,218.60
4. Step 4: Simplify right side
   2,213.35x = 3,722,061.38
5. Step 5: Solve for x
   x = 3,722,061.38/2,213.35
6. Step 6: Final answer
   x = 1,681.64