Finding the Fourth Proportional to 2,606.15, 3,908.54 and 1,218.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.15 : 3,908.54 = 1,218.78 : x
2. Step 2: Convert to fraction form
   2,606.15/3,908.54 = 1,218.78/x
3. Step 3: Cross multiply
   2,606.15x = 3,908.54 × 1,218.78
4. Step 4: Simplify right side
   2,606.15x = 4,763,653.43
5. Step 5: Solve for x
   x = 4,763,653.43/2,606.15
6. Step 6: Final answer
   x = 1,827.85