Finding the Fourth Proportional to 10,928.70, 16,388.85 and 3,907.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,928.70 : 16,388.85 = 3,907.39 : x
2. Step 2: Convert to fraction form
   10,928.70/16,388.85 = 3,907.39/x
3. Step 3: Cross multiply
   10,928.70x = 16,388.85 × 3,907.39
4. Step 4: Simplify right side
   10,928.70x = 64,037,628.60
5. Step 5: Solve for x
   x = 64,037,628.60/10,928.70
6. Step 6: Final answer
   x = 5,859.58