Finding the Third Proportional to 473,443 and 639,860.50

Step by Step Solution

1. Step 1: Write the proportion equation
   473,443 : 639,860.50 = 639,860.50 : x
2. Step 2: Convert to fraction form
   473,443/639,860.50 = 639,860.50/x
3. Step 3: Cross multiply
   473,443x = 639,860.50 × 639,860.50
4. Step 4: Simplify right side
   473,443x = 409,421,459,460.25
5. Step 5: Solve for x
   x = 409,421,459,460.25/473,443
6. Step 6: Final answer
   x = 864,774.55