Finding the Third Proportional to 306,976.50 and 626,436

Step by Step Solution

1. Step 1: Write the proportion equation
   306,976.50 : 626,436 = 626,436 : x
2. Step 2: Convert to fraction form
   306,976.50/626,436 = 626,436/x
3. Step 3: Cross multiply
   306,976.50x = 626,436 × 626,436
4. Step 4: Simplify right side
   306,976.50x = 392,422,062,096
5. Step 5: Solve for x
   x = 392,422,062,096/306,976.50
6. Step 6: Final answer
   x = 1,278,345.61