Finding the Third Proportional to 298,903.50 and 646,650

Step by Step Solution

1. Step 1: Write the proportion equation
   298,903.50 : 646,650 = 646,650 : x
2. Step 2: Convert to fraction form
   298,903.50/646,650 = 646,650/x
3. Step 3: Cross multiply
   298,903.50x = 646,650 × 646,650
4. Step 4: Simplify right side
   298,903.50x = 418,156,222,500
5. Step 5: Solve for x
   x = 418,156,222,500/298,903.50
6. Step 6: Final answer
   x = 1,398,967.30