Finding the Third Proportional to 320,017.50 and 687,479.06

Step by Step Solution

1. Step 1: Write the proportion equation
   320,017.50 : 687,479.06 = 687,479.06 : x
2. Step 2: Convert to fraction form
   320,017.50/687,479.06 = 687,479.06/x
3. Step 3: Cross multiply
   320,017.50x = 687,479.06 × 687,479.06
4. Step 4: Simplify right side
   320,017.50x = 472,627,461,375.88
5. Step 5: Solve for x
   x = 472,627,461,375.88/320,017.50
6. Step 6: Final answer
   x = 1,476,880.05