Finding the Fourth Proportional to 2,503.86, 3,755.78 and 860.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,503.86 : 3,755.78 = 860.53 : x
2. Step 2: Convert to fraction form
   2,503.86/3,755.78 = 860.53/x
3. Step 3: Cross multiply
   2,503.86x = 3,755.78 × 860.53
4. Step 4: Simplify right side
   2,503.86x = 3,231,938.28
5. Step 5: Solve for x
   x = 3,231,938.28/2,503.86
6. Step 6: Final answer
   x = 1,290.78