Finding the Third Proportional to 299,436 and 646,843.50

Step by Step Solution

1. Step 1: Write the proportion equation
   299,436 : 646,843.50 = 646,843.50 : x
2. Step 2: Convert to fraction form
   299,436/646,843.50 = 646,843.50/x
3. Step 3: Cross multiply
   299,436x = 646,843.50 × 646,843.50
4. Step 4: Simplify right side
   299,436x = 418,406,513,492.25
5. Step 5: Solve for x
   x = 418,406,513,492.25/299,436
6. Step 6: Final answer
   x = 1,397,315.33