Finding the Fourth Proportional to 2,185.79, 3,278.72 and 1,218.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.79 : 3,278.72 = 1,218.04 : x
2. Step 2: Convert to fraction form
   2,185.79/3,278.72 = 1,218.04/x
3. Step 3: Cross multiply
   2,185.79x = 3,278.72 × 1,218.04
4. Step 4: Simplify right side
   2,185.79x = 3,993,606.02
5. Step 5: Solve for x
   x = 3,993,606.02/2,185.79
6. Step 6: Final answer
   x = 1,827.08