Finding the Fourth Proportional to 2,645.20, 3,956.46 and 2,574.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.20 : 3,956.46 = 2,574.46 : x
2. Step 2: Convert to fraction form
   2,645.20/3,956.46 = 2,574.46/x
3. Step 3: Cross multiply
   2,645.20x = 3,956.46 × 2,574.46
4. Step 4: Simplify right side
   2,645.20x = 10,185,748.01
5. Step 5: Solve for x
   x = 10,185,748.01/2,645.20
6. Step 6: Final answer
   x = 3,850.65