Finding the Fourth Proportional to 2,485.05, 3,719.58 and 1,313.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.05 : 3,719.58 = 1,313.40 : x
2. Step 2: Convert to fraction form
   2,485.05/3,719.58 = 1,313.40/x
3. Step 3: Cross multiply
   2,485.05x = 3,719.58 × 1,313.40
4. Step 4: Simplify right side
   2,485.05x = 4,885,296.37
5. Step 5: Solve for x
   x = 4,885,296.37/2,485.05
6. Step 6: Final answer
   x = 1,965.87