Finding the Fourth Proportional to 2,504.88, 3,456.65 and 1,385.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,504.88 : 3,456.65 = 1,385.78 : x
2. Step 2: Convert to fraction form
   2,504.88/3,456.65 = 1,385.78/x
3. Step 3: Cross multiply
   2,504.88x = 3,456.65 × 1,385.78
4. Step 4: Simplify right side
   2,504.88x = 4,790,142.62
5. Step 5: Solve for x
   x = 4,790,142.62/2,504.88
6. Step 6: Final answer
   x = 1,912.32