Finding the Fourth Proportional to 2,458.78, 3,685.94 and 1,226.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,458.78 : 3,685.94 = 1,226.57 : x
2. Step 2: Convert to fraction form
   2,458.78/3,685.94 = 1,226.57/x
3. Step 3: Cross multiply
   2,458.78x = 3,685.94 × 1,226.57
4. Step 4: Simplify right side
   2,458.78x = 4,521,071.10
5. Step 5: Solve for x
   x = 4,521,071.10/2,458.78
6. Step 6: Final answer
   x = 1,838.74