Finding the Third Proportional to 128,521.69 and 188,390.81

Step by Step Solution

1. Step 1: Write the proportion equation
   128,521.69 : 188,390.81 = 188,390.81 : x
2. Step 2: Convert to fraction form
   128,521.69/188,390.81 = 188,390.81/x
3. Step 3: Cross multiply
   128,521.69x = 188,390.81 × 188,390.81
4. Step 4: Simplify right side
   128,521.69x = 35,491,098,234.41
5. Step 5: Solve for x
   x = 35,491,098,234.41/128,521.69
6. Step 6: Final answer
   x = 276,148.71