Finding the Fourth Proportional to 3,911.39, 5,865.82 and 1,313.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.39 : 5,865.82 = 1,313.72 : x
2. Step 2: Convert to fraction form
   3,911.39/5,865.82 = 1,313.72/x
3. Step 3: Cross multiply
   3,911.39x = 5,865.82 × 1,313.72
4. Step 4: Simplify right side
   3,911.39x = 7,706,034.43
5. Step 5: Solve for x
   x = 7,706,034.43/3,911.39
6. Step 6: Final answer
   x = 1,970.15