Finding the Third Proportional to 311,403 and 680,965.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,403 : 680,965.50 = 680,965.50 : x
2. Step 2: Convert to fraction form
   311,403/680,965.50 = 680,965.50/x
3. Step 3: Cross multiply
   311,403x = 680,965.50 × 680,965.50
4. Step 4: Simplify right side
   311,403x = 463,714,012,190.25
5. Step 5: Solve for x
   x = 463,714,012,190.25/311,403
6. Step 6: Final answer
   x = 1,489,112.22