Finding the Fourth Proportional to 2,558.61, 3,836.73 and 914.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.61 : 3,836.73 = 914.78 : x
2. Step 2: Convert to fraction form
   2,558.61/3,836.73 = 914.78/x
3. Step 3: Cross multiply
   2,558.61x = 3,836.73 × 914.78
4. Step 4: Simplify right side
   2,558.61x = 3,509,744.69
5. Step 5: Solve for x
   x = 3,509,744.69/2,558.61
6. Step 6: Final answer
   x = 1,371.74