Finding the Third Proportional to 428,034 and 663,691.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,034 : 663,691.50 = 663,691.50 : x
2. Step 2: Convert to fraction form
   428,034/663,691.50 = 663,691.50/x
3. Step 3: Cross multiply
   428,034x = 663,691.50 × 663,691.50
4. Step 4: Simplify right side
   428,034x = 440,486,407,172.25
5. Step 5: Solve for x
   x = 440,486,407,172.25/428,034
6. Step 6: Final answer
   x = 1,029,092.10