Finding the Fourth Proportional to 3,910.55, 5,865.82 and 1,315.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.55 : 5,865.82 = 1,315.31 : x
2. Step 2: Convert to fraction form
   3,910.55/5,865.82 = 1,315.31/x
3. Step 3: Cross multiply
   3,910.55x = 5,865.82 × 1,315.31
4. Step 4: Simplify right side
   3,910.55x = 7,715,371.70
5. Step 5: Solve for x
   x = 7,715,371.70/3,910.55
6. Step 6: Final answer
   x = 1,972.96