Finding the Fourth Proportional to 3,945.86, 5,919.11 and 1,313.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.86 : 5,919.11 = 1,313.27 : x
2. Step 2: Convert to fraction form
   3,945.86/5,919.11 = 1,313.27/x
3. Step 3: Cross multiply
   3,945.86x = 5,919.11 × 1,313.27
4. Step 4: Simplify right side
   3,945.86x = 7,773,389.59
5. Step 5: Solve for x
   x = 7,773,389.59/3,945.86
6. Step 6: Final answer
   x = 1,970.01