Finding the Fourth Proportional to 80,756.72, 111,073.38 and 64,806.20

Step by Step Solution

1. Step 1: Write the proportion equation
   80,756.72 : 111,073.38 = 64,806.20 : x
2. Step 2: Convert to fraction form
   80,756.72/111,073.38 = 64,806.20/x
3. Step 3: Cross multiply
   80,756.72x = 111,073.38 × 64,806.20
4. Step 4: Simplify right side
   80,756.72x = 7,198,243,678.96
5. Step 5: Solve for x
   x = 7,198,243,678.96/80,756.72
6. Step 6: Final answer
   x = 89,134.92