Finding the Third Proportional to 391,837.50 and 800,280

Step by Step Solution

1. Step 1: Write the proportion equation
   391,837.50 : 800,280 = 800,280 : x
2. Step 2: Convert to fraction form
   391,837.50/800,280 = 800,280/x
3. Step 3: Cross multiply
   391,837.50x = 800,280 × 800,280
4. Step 4: Simplify right side
   391,837.50x = 640,448,078,400
5. Step 5: Solve for x
   x = 640,448,078,400/391,837.50
6. Step 6: Final answer
   x = 1,634,473.67