Finding the Fourth Proportional to 2,503.79, 3,755.77 and 860.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,503.79 : 3,755.77 = 860.32 : x
2. Step 2: Convert to fraction form
   2,503.79/3,755.77 = 860.32/x
3. Step 3: Cross multiply
   2,503.79x = 3,755.77 × 860.32
4. Step 4: Simplify right side
   2,503.79x = 3,231,166.59
5. Step 5: Solve for x
   x = 3,231,166.59/2,503.79
6. Step 6: Final answer
   x = 1,290.51