Finding the Fourth Proportional to 80,757.72, 111,074.76 and 64,807.20

Step by Step Solution

1. Step 1: Write the proportion equation
   80,757.72 : 111,074.76 = 64,807.20 : x
2. Step 2: Convert to fraction form
   80,757.72/111,074.76 = 64,807.20/x
3. Step 3: Cross multiply
   80,757.72x = 111,074.76 × 64,807.20
4. Step 4: Simplify right side
   80,757.72x = 7,198,444,186.27
5. Step 5: Solve for x
   x = 7,198,444,186.27/80,757.72
6. Step 6: Final answer
   x = 89,136.30