Finding the Third Proportional to 406,478 and 603,821.50

Step by Step Solution

1. Step 1: Write the proportion equation
   406,478 : 603,821.50 = 603,821.50 : x
2. Step 2: Convert to fraction form
   406,478/603,821.50 = 603,821.50/x
3. Step 3: Cross multiply
   406,478x = 603,821.50 × 603,821.50
4. Step 4: Simplify right side
   406,478x = 364,600,403,862.25
5. Step 5: Solve for x
   x = 364,600,403,862.25/406,478
6. Step 6: Final answer
   x = 896,974.51