Finding the Fourth Proportional to 2,503.87, 3,756.05 and 860.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,503.87 : 3,756.05 = 860.20 : x
2. Step 2: Convert to fraction form
   2,503.87/3,756.05 = 860.20/x
3. Step 3: Cross multiply
   2,503.87x = 3,756.05 × 860.20
4. Step 4: Simplify right side
   2,503.87x = 3,230,935.43
5. Step 5: Solve for x
   x = 3,230,935.43/2,503.87
6. Step 6: Final answer
   x = 1,290.38