Finding the Third Proportional to 312,634.50 and 636,318

Step by Step Solution

1. Step 1: Write the proportion equation
   312,634.50 : 636,318 = 636,318 : x
2. Step 2: Convert to fraction form
   312,634.50/636,318 = 636,318/x
3. Step 3: Cross multiply
   312,634.50x = 636,318 × 636,318
4. Step 4: Simplify right side
   312,634.50x = 404,900,597,124
5. Step 5: Solve for x
   x = 404,900,597,124/312,634.50
6. Step 6: Final answer
   x = 1,295,124.49