Finding the Third Proportional to 312,666 and 636,373.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,666 : 636,373.50 = 636,373.50 : x
2. Step 2: Convert to fraction form
   312,666/636,373.50 = 636,373.50/x
3. Step 3: Cross multiply
   312,666x = 636,373.50 × 636,373.50
4. Step 4: Simplify right side
   312,666x = 404,971,231,502.25
5. Step 5: Solve for x
   x = 404,971,231,502.25/312,666
6. Step 6: Final answer
   x = 1,295,219.92