Finding the Third Proportional to 298,906 and 645,032

Step by Step Solution

1. Step 1: Write the proportion equation
   298,906 : 645,032 = 645,032 : x
2. Step 2: Convert to fraction form
   298,906/645,032 = 645,032/x
3. Step 3: Cross multiply
   298,906x = 645,032 × 645,032
4. Step 4: Simplify right side
   298,906x = 416,066,281,024
5. Step 5: Solve for x
   x = 416,066,281,024/298,906
6. Step 6: Final answer
   x = 1,391,963.63