Finding the Fourth Proportional to 3,923.60, 5,906.78 and 3,387.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.60 : 5,906.78 = 3,387.92 : x
2. Step 2: Convert to fraction form
   3,923.60/5,906.78 = 3,387.92/x
3. Step 3: Cross multiply
   3,923.60x = 5,906.78 × 3,387.92
4. Step 4: Simplify right side
   3,923.60x = 20,011,698.10
5. Step 5: Solve for x
   x = 20,011,698.10/3,923.60
6. Step 6: Final answer
   x = 5,100.34