Finding the Fourth Proportional to 10,919.67, 16,379.46 and 3,128.46

Step by Step Solution

1. Step 1: Write the proportion equation
   10,919.67 : 16,379.46 = 3,128.46 : x
2. Step 2: Convert to fraction form
   10,919.67/16,379.46 = 3,128.46/x
3. Step 3: Cross multiply
   10,919.67x = 16,379.46 × 3,128.46
4. Step 4: Simplify right side
   10,919.67x = 51,242,485.43
5. Step 5: Solve for x
   x = 51,242,485.43/10,919.67
6. Step 6: Final answer
   x = 4,692.68