Finding the Fourth Proportional to 2,539.05, 3,807.90 and 873.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.05 : 3,807.90 = 873.15 : x
2. Step 2: Convert to fraction form
   2,539.05/3,807.90 = 873.15/x
3. Step 3: Cross multiply
   2,539.05x = 3,807.90 × 873.15
4. Step 4: Simplify right side
   2,539.05x = 3,324,867.89
5. Step 5: Solve for x
   x = 3,324,867.89/2,539.05
6. Step 6: Final answer
   x = 1,309.49