Finding the Third Proportional to 391,836 and 800,275.50

Step by Step Solution

1. Step 1: Write the proportion equation
   391,836 : 800,275.50 = 800,275.50 : x
2. Step 2: Convert to fraction form
   391,836/800,275.50 = 800,275.50/x
3. Step 3: Cross multiply
   391,836x = 800,275.50 × 800,275.50
4. Step 4: Simplify right side
   391,836x = 640,440,875,900.25
5. Step 5: Solve for x
   x = 640,440,875,900.25/391,836
6. Step 6: Final answer
   x = 1,634,461.55