Finding the Fourth Proportional to 4,871.32, 6,724.55 and 3,105.25

Step by Step Solution

1. Step 1: Write the proportion equation
   4,871.32 : 6,724.55 = 3,105.25 : x
2. Step 2: Convert to fraction form
   4,871.32/6,724.55 = 3,105.25/x
3. Step 3: Cross multiply
   4,871.32x = 6,724.55 × 3,105.25
4. Step 4: Simplify right side
   4,871.32x = 20,881,359.74
5. Step 5: Solve for x
   x = 20,881,359.74/4,871.32
6. Step 6: Final answer
   x = 4,286.60