Finding the Third Proportional to 443,345.16 and 687,889.69

Step by Step Solution

1. Step 1: Write the proportion equation
   443,345.16 : 687,889.69 = 687,889.69 : x
2. Step 2: Convert to fraction form
   443,345.16/687,889.69 = 687,889.69/x
3. Step 3: Cross multiply
   443,345.16x = 687,889.69 × 687,889.69
4. Step 4: Simplify right side
   443,345.16x = 473,192,222,168.85
5. Step 5: Solve for x
   x = 473,192,222,168.85/443,345.16
6. Step 6: Final answer
   x = 1,067,322.41