Finding the Fourth Proportional to 10,928.98, 16,389.45 and 3,907.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,928.98 : 16,389.45 = 3,907.09 : x
2. Step 2: Convert to fraction form
   10,928.98/16,389.45 = 3,907.09/x
3. Step 3: Cross multiply
   10,928.98x = 16,389.45 × 3,907.09
4. Step 4: Simplify right side
   10,928.98x = 64,035,056.20
5. Step 5: Solve for x
   x = 64,035,056.20/10,928.98
6. Step 6: Final answer
   x = 5,859.20