Finding the Fourth Proportional to 2,563.58, 3,845.88 and 919.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,563.58 : 3,845.88 = 919.69 : x
2. Step 2: Convert to fraction form
   2,563.58/3,845.88 = 919.69/x
3. Step 3: Cross multiply
   2,563.58x = 3,845.88 × 919.69
4. Step 4: Simplify right side
   2,563.58x = 3,537,017.38
5. Step 5: Solve for x
   x = 3,537,017.38/2,563.58
6. Step 6: Final answer
   x = 1,379.72