Finding the Fourth Proportional to 3,965.31, 5,939.60 and 2,574.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.31 : 5,939.60 = 2,574.50 : x
2. Step 2: Convert to fraction form
   3,965.31/5,939.60 = 2,574.50/x
3. Step 3: Cross multiply
   3,965.31x = 5,939.60 × 2,574.50
4. Step 4: Simplify right side
   3,965.31x = 15,291,457.63
5. Step 5: Solve for x
   x = 15,291,457.63/3,965.31
6. Step 6: Final answer
   x = 3,856.31