Finding the Fourth Proportional to 53,739.12, 80,068.56 and 50,721

Step by Step Solution

1. Step 1: Write the proportion equation
   53,739.12 : 80,068.56 = 50,721 : x
2. Step 2: Convert to fraction form
   53,739.12/80,068.56 = 50,721/x
3. Step 3: Cross multiply
   53,739.12x = 80,068.56 × 50,721
4. Step 4: Simplify right side
   53,739.12x = 4,061,157,431.76
5. Step 5: Solve for x
   x = 4,061,157,431.76/53,739.12
6. Step 6: Final answer
   x = 75,571.71