Finding the Fourth Proportional to 128,018.72, 176,616.56 and 80,188.80

Step by Step Solution

1. Step 1: Write the proportion equation
   128,018.72 : 176,616.56 = 80,188.80 : x
2. Step 2: Convert to fraction form
   128,018.72/176,616.56 = 80,188.80/x
3. Step 3: Cross multiply
   128,018.72x = 176,616.56 × 80,188.80
4. Step 4: Simplify right side
   128,018.72x = 14,162,670,006.53
5. Step 5: Solve for x
   x = 14,162,670,006.53/128,018.72
6. Step 6: Final answer
   x = 110,629.68