Finding the Fourth Proportional to 80,940.15, 111,692.16 and 45,128.07

Step by Step Solution

1. Step 1: Write the proportion equation
   80,940.15 : 111,692.16 = 45,128.07 : x
2. Step 2: Convert to fraction form
   80,940.15/111,692.16 = 45,128.07/x
3. Step 3: Cross multiply
   80,940.15x = 111,692.16 × 45,128.07
4. Step 4: Simplify right side
   80,940.15x = 5,040,451,614.93
5. Step 5: Solve for x
   x = 5,040,451,614.93/80,940.15
6. Step 6: Final answer
   x = 62,273.81