Finding the Fourth Proportional to 3,978.65, 5,968.44 and 1,310.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.65 : 5,968.44 = 1,310.15 : x
2. Step 2: Convert to fraction form
   3,978.65/5,968.44 = 1,310.15/x
3. Step 3: Cross multiply
   3,978.65x = 5,968.44 × 1,310.15
4. Step 4: Simplify right side
   3,978.65x = 7,819,521.82
5. Step 5: Solve for x
   x = 7,819,521.82/3,978.65
6. Step 6: Final answer
   x = 1,965.37