Finding the Fourth Proportional to 13,825.72, 20,738.94 and 3,964.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,825.72 : 20,738.94 = 3,964.60 : x
2. Step 2: Convert to fraction form
   13,825.72/20,738.94 = 3,964.60/x
3. Step 3: Cross multiply
   13,825.72x = 20,738.94 × 3,964.60
4. Step 4: Simplify right side
   13,825.72x = 82,221,601.52
5. Step 5: Solve for x
   x = 82,221,601.52/13,825.72
6. Step 6: Final answer
   x = 5,947.00