Finding the Fourth Proportional to 10,919.10, 16,377.93 and 3,128.70

Step by Step Solution

1. Step 1: Write the proportion equation
   10,919.10 : 16,377.93 = 3,128.70 : x
2. Step 2: Convert to fraction form
   10,919.10/16,377.93 = 3,128.70/x
3. Step 3: Cross multiply
   10,919.10x = 16,377.93 × 3,128.70
4. Step 4: Simplify right side
   10,919.10x = 51,241,629.59
5. Step 5: Solve for x
   x = 51,241,629.59/10,919.10
6. Step 6: Final answer
   x = 4,692.84