Finding the Fourth Proportional to 80,563.72, 120,721.38 and 43,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   80,563.72 : 120,721.38 = 43,128.76 : x
2. Step 2: Convert to fraction form
   80,563.72/120,721.38 = 43,128.76/x
3. Step 3: Cross multiply
   80,563.72x = 120,721.38 × 43,128.76
4. Step 4: Simplify right side
   80,563.72x = 5,206,563,424.89
5. Step 5: Solve for x
   x = 5,206,563,424.89/80,563.72
6. Step 6: Final answer
   x = 64,626.65