Finding the Fourth Proportional to 78,128.01, 107,745.79 and 51,260.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,128.01 : 107,745.79 = 51,260.31 : x
2. Step 2: Convert to fraction form
   78,128.01/107,745.79 = 51,260.31/x
3. Step 3: Cross multiply
   78,128.01x = 107,745.79 × 51,260.31
4. Step 4: Simplify right side
   78,128.01x = 5,523,082,468.44
5. Step 5: Solve for x
   x = 5,523,082,468.44/78,128.01
6. Step 6: Final answer
   x = 70,692.73