Finding the Third Proportional to 298,725 and 645,150

Step by Step Solution

1. Step 1: Write the proportion equation
   298,725 : 645,150 = 645,150 : x
2. Step 2: Convert to fraction form
   298,725/645,150 = 645,150/x
3. Step 3: Cross multiply
   298,725x = 645,150 × 645,150
4. Step 4: Simplify right side
   298,725x = 416,218,522,500
5. Step 5: Solve for x
   x = 416,218,522,500/298,725
6. Step 6: Final answer
   x = 1,393,316.67